Abraham Isaac HaCohen Kook (Hebrew: אַבְרָהָם יִצְחָק הַכֹּהֵן קוּק; 7 September 1865 – 1 September 1935), known as HaRav Kook, and also known by the Hebrew-language acronym Hara'ayah (הראי״ה), was an Orthodox rabbi, and the first Ashkenazi Chief Rabbi of British Mandatory Palestine. He is considered to be one of the fathers of religious Zionism and is known for founding the Mercaz HaRav Yeshiva.
Contents
Biography
Childhood
Kook was born in Griva (also spelled Geriva) in the Courland Governorate of the Russian Empire in 1865, today a part of Daugavpils, Latvia, the eldest of eight children. His father, Rabbi Shlomo Zalman Ha-Cohen Kook, was a student of the Volozhin yeshiva, the "mother of the Lithuanian yeshivas", whereas his maternal grandfather was a follower of the Kapust branch of the Hasidic movement, founded by the son of the third rebbe of Chabad, Rabbi Menachem Mendel Schneersohn. His mother's name was Zlata Perl.
He entered the Volozhin Yeshiva in 1884 at the age of 18, where he became close to the rosh yeshiva, Rabbi Naftali Zvi Yehuda Berlin (the Netziv). During his time in the yeshiva, he studied under Rabbi Eliyahu David Rabinowitz-Teomim (also known as the Aderet), the rabbi of Ponevezh (today's Panevėžys, Lithuania) and later Chief Ashkenazi Rabbi of Jerusalem. In 1886 Kook married Rabinowitz-Teomim's daughter, Batsheva.
Early career
In 1887, at the age of 23, Kook entered his first rabbinical position as rabbi of Zaumel, Lithuania. In 1888, his wife died, and his father-in-law convinced him to marry her cousin, Raize-Rivka, the daughter of the Aderet's twin brother. Kook's only son, Zvi Yehuda Kook, was born in 1891 to Kook and his second wife. In 1896, Kook became the rabbi of Bauska.
While serving in Boisk, Kook gave an approbation, dated 1902, to the responsa work Beit Yedidya by Rabbi Shaul Yedidya Shochet, later a rabbi in Chicago.
Between 1901 and 1904, he published three articles which anticipate the philosophy that he later more fully developed in the Land of Israel. His disciple David Cohen, known as "Rav HaNazir" or "the Nazir of Jerusalem", later compiled extracts from Kook's writings on animals and vegetarianism under the title A Vision of Vegetarianism and Peace.
Jaffa
In 1904, Kook was invited to become Rabbi in Jaffa, Ottoman Palestine, and he arrived there in 1905. During these years he wrote a number of works, mostly published posthumously, notably a lengthy commentary on the Aggadot of Tractates Berakhot and Shabbat, titled Eyn Ayah, and a brief book on morality and spirituality, titled Mussar Avicha.
It was in 1911 that Kook also maintained a correspondence with the Jews of Yemen, addressing some twenty-six questions to "the honorable shepherds of God's congregation" (Heb. כבוד רועי עדת ד) and sending his letter via the known Zionist emissary, Shemuel Yavneʼeli. Their reply was later printed in a book published by Yavneʼeli. Kook's influence on people in different walks of life was already noticeable, as he engaged in kiruv ("Jewish outreach"), thereby creating a greater role for Torah and Halakha in the life of the city and the nearby settlements. In 1913 Kook led a delegation of rabbis, including several leading rabbinic figures such as Rabbi Yosef Chaim Sonnenfeld, to the many newly established secular "moshavot" (settlements) in Samaria and Galilee. Known as the "Journey of the Rabbis" the rabbis' goal was to strengthen Shabbat observance, Torah education, and other religious observances, with an emphasis on the giving of 'terumot and ma'asrot' (agricultural tithes) as these were farming settlements.
London and World War I
When the First World War began, Kook was in Germany, where he was interned as an alien. He escaped to London via Switzerland, but the ongoing conflict forced him to stay in the UK for the remainder of the war. The Kooks arrived in London on January 28, 1916, and moved into lodgings provided by Mendel Chaikin, a Chabad Hasid and vintner. He became rabbi of the Spitalfields Great Synagogue (Machzike Hadath, "upholders of the law"), a strictly Orthodox community located in Brick Lane, Spitalfields, London, and Kook lived at 9 Princelet Street, Spitalfields.
Chief Rabbi of Jerusalem
Upon returning from Europe in 1919, he was appointed the Ashkenazi Chief Rabbi of Jerusalem, and soon after, as first Ashkenazi Chief Rabbi of Palestine in 1921.
In March 1924, in an effort to raise funds for Torah institutions in Palestine and Europe, Kook travelled to America with Rabbi Moshe Mordechai Epstein of the Slabodka Yeshiva and the Rabbi of Kaunas, Avraham Dov Baer Kahana Shapiro. In the same year, Kook founded the Mercaz HaRav yeshiva in Jerusalem.
Kook died in Jerusalem in 1935 and his funeral was attended by an estimated 20,000 mourners.
Alliances
Kook maintained communication and political alliances with various Jewish sectors, including the secular Jewish Zionist leadership, the Religious Zionists, and more traditional non-Zionist Orthodox Jews.
Inauguration of Hebrew University
In 1928, Kook wrote a letter to Rabbi Joseph Messas (Chief Rabbi in Algeria), addressing certain misquotes which were erroneously being repeated in his name regarding a speech he gave at the inauguration of Hebrew University. The following are translated excerpts from the letter Kook wrote to Messas:
...from the time that I came to the Holy Land, it has been my goal to the best of my ability to draw also those who are estranged and speak to their heart, so that they will come close to Torah and mitzvot – including even those young people who want to develop their physical health so that they will have the strength to protect our holy nation in times of violence, Heaven forbid, at a time when vicious enemies rise up against us...in regard to Hebrew University, Heaven forbid that I should say regarding secular studies that 'From Zion will come forth Torah.'
To the contrary, I told them explicitly that I am afraid lest there come forth, Heaven forbid, a stumbling block from their hands if they reject the Torah and the fear of God and 'please themselves in the brood of aliens' [i.e., studies antithetical to Torah such as Biblical Criticism]. I brought them examples of this from the past, from the incidents that took place due to people's sins [during the Berlin Enlightenment], from which came forth groups that turned away from God and abandoned the source of living waters. But they must guard the holiness of Israel, teachers and students alike, and not follow foreign ideas nor turn aside from the Torah and the mitzvos. And even then, it is not from secular subjects that Torah will come forth, but rather when we support the holy yeshivas, which are dedicated solely to the holiness of the Torah.
Together with this, [I told them that] they should elevate the power of the tzaddikim and Torah giants who fear God. And the Central Yeshiva [Mercaz HaRav] in our holy and beautiful city, which we are toiling to establish and expand with God's help, will stand in its great glory. Then, upon the foundation of the holy yeshivas, I said that the verse 'From Zion will come forth Torah' will be fulfilled.
These words are explicit in my speech that I spoke at that time before the people, before all of the important officials who came to the celebration, and to the entire great crowd of thousands who came from the far ends of the Holy Land and from the lands of the Diaspora. So how can malicious people come to distort the words of the living God in a way that is so filled with wickedness and folly?...
Theodor Herzl eulogy
In 1904, Kook wrote a letter to his father-in-law, addressing certain misquotes which were erroneously being repeated in his name regarding a speech he gave after Theodor Herzl's passing:
...Now, two gentlemen came to me… and requested me … since they were planning to gather in the bank building here to honor the memory of Dr. Herzl and it was their finding that even those opposed to Zionism would not deny that there were in his heart thoughts concerning the betterment of Israel. Although unfortunately [Herzl] did not find the straight path, nevertheless, 'The Holy One does not withhold credit for even good talk.' It would be poor manners not to arrange a memorial in his honor in a public meeting place, such as the Anglo-Palestine Bank here. Therefore I promised them I would attend.
Understandably, once I agreed to come, I did not want to refuse to speak some words. I assessed that, God willing, benefit would derive from my words, inasmuch as the other speakers would not have the audacity to belittle God, His Torah, and the sages of Israel.
Thank God, this assessment proved correct. Of course, I spoke pleasantly and politely, but I did reveal the fundamental failure of their [the Zionists'] entire enterprise, namely the fact that they do not place at the top of their list of priorities the sanctity of God and His great name, which is the power that enables Israel to survive ... In my remarks, I offered no homage to Dr. Herzl per se.
What I did say was that such a thought of improving the situation of Israel in Eretz Israel would be worthwhile if we would rise to the occasion. It would require a return to God by observing and honoring the Torah, and a consensus that the foundation of all must be the power of Torah. Repenting of baseless hatred, and wholehearted peace-seeking as obligated [by Torah] would result in success because it would be close to God's will. We must make amends toward the future that the power of the sanctity of Torah be at the top of our list of priorities, that "the son of Yishai lead." If the will to improve materially will rest on Torah – then God will shine His face upon us and crown our every deed with success. At first, the salvation will be gradual, as our holy Rabbis remarked upon witnessing daybreak over the valley of Arbel, but after it will gain momentum, appearing as a great and wondrous light, as in the days of our Exodus from Egypt.
Attitude toward Zionism
While Kook is considered one of the most important thinkers in modern Religious Zionism, his attitude towards the "Zionism" of his time was complex.
Kook enthusiastically supported the settlement of the land which Zionists of his time were carrying out. In addition, his philosophy "la[id] a theological foundation for marrying Torah study to Zionism, and for an ethos of traditional Judaism engaged with Zionism and with modernity". And unlike many of his religious peers, he showed respect towards secular Zionists, and willingly engaged in joint projects with them (for instance, his participation in the Chief Rabbinate).
At the same time, he was critical of the religious-Zionist Mizrachi movement of his time for "tamping down religious fervor and willingly accepting secondary status within the Zionist movement". In 1917 he issued a proclamation entitled Degel Yerushalayim, where he distinguished between "Zion" (representing political sovereignty) and "Jerusalem" (representing holiness), and arguing that Zion (i.e. Zionism) must take a cooperative but eventually subservient role in relation to Jerusalem. He then went on to found a "Degel Yerushalayim" movement separate from the Zionist movement, though this initiative had little success.
Legacy
The Israeli moshav Kfar Haroeh, a settlement founded in 1933, was named after Kook, "Haroah" being a Hebrew acronym for "HaRav Avraham HaCohen". His son Zvi Yehuda Kook, who was also his most prominent student, took over teaching duties at Mercaz HaRav after his death, and dedicated his life to disseminating his father's writings. Many students of Kook's writings and philosophy eventually formed Hardal Religious Zionist movement which is today led by rabbis who studied under Kook's son at Mercaz HaRav.
In 1937, Yehuda Leib Maimon established Mossad Harav Kook, a religious research foundation and notable publishing house, based in Jerusalem. It is named after Kook.
Teachings
A central principle in Rav Kook's philosophy is ahavat chinam ("baseless" or unconditional love) among Jews. His writings stress that ahavat chinam is central to spiritual and communal renewal, a theme he develops extensively in his book "Orot HaKodesh". He held that the historic destruction of the Second Temple, often attributed to "sinat chinam" (baseless hatred), could only be remedied by cultivating love and unity among all Jews even those far removed from traditional religious observance. Rav Kook argued that this love is not blind or naive; rather, it flows from a deep awareness of the shared spiritual destiny and inherent worth of every Jew. This concept of universal Jewish unity, grounded in compassion, respect, and mutual responsibility, became a hallmark of his legacy, influencing religious Zionist thought, educational institutions, and Jewish communal discourse worldwide.
In line with many orthodox interpreters of the Jewish religion, Kook believed that there was a fundamental difference between Jews and Gentiles.
“The difference between the Israelite neshama [spiritual soul]...and the neshama of all the nations, in their various grades, is greater and deeper than the difference between the nefesh [biological soul]... of man and the nefesh of animals. For between the latter there is only a quantitative difference, while between the former there exists a qualitative, essential difference.”
Animals and vegetarianism
Kook developed a theological and ethical account of human relations with animals. Between 1903 and 1904, he published a series of essays in the Hebrew periodical Ha-Peles that were later edited by his disciple David Cohen and published as A Vision of Vegetarianism and Peace. Y. Michael Barilan describes the work as the only treatise in rabbinic Judaism devoted to the relationship between humans and animals and argues that the subject was central to Kook's ethical thought, while Idan Breier describes it as the first systematic Jewish treatise on human-animal relations.
Kook interpreted the creation account in Genesis as depicting an original state in which neither humans nor animals killed other creatures for food. He rejected the view that human dominion gave humans a licence to kill or exploit animals, and held that compassion towards animals was a duty imposed by God. He also wrote that human and animal souls ultimately derive from the same source of life. In Kook's account, humanity's subsequent moral decline led God to permit meat-eating as a temporary concession to human weakness. He therefore regarded the use of animals as a transitional condition rather than an expression of an inherent human entitlement to exploit them.
Kook held that ethical development should proceed gradually. He did not advocate vegetarianism as an immediate social programme, arguing that it was appropriate only for individuals capable of adopting it without neglecting moral obligations towards other humans; Kook himself was not a vegetarian. He interpreted Jewish dietary laws and other commandments concerning animals as means of limiting animal suffering and educating humans towards greater consideration for animals. These included restrictions on slaughter, the consumption of blood, taking a mother bird with her young, and the use of animal products such as milk and wool.
Kook's account was also eschatological. He interpreted biblical prophecies of peaceful relations among animals literally and held that humanity and the animal world would ultimately return to a state in which killing and predation had ceased. In this future condition, humans would no longer desire meat and justice and compassion would extend throughout relations between humans and other animals.
Controversy
Criticism from rabbinic scholars
In formulating religious Zionism, Kook broke with many other Orthodox rabbis.
Many Orthodox rabbis saw nothing but evil in the early Zionist pioneers who were hostile to religion, and in their belief that their labor rather than God would save the Jewish people. Kook on the other hand, defended their behaviour in theological terms, and even hailed them as playing a role, by their labors, in hastening the messianic deliverance. His stance was deemed heretical by the traditional religious establishment.
Although Kook was a very learned man, he was never accepted by the Haredi leadership.
In 1921 his detractors bought up the whole edition of his newly published Orot to prevent its circulation, plastering the offending passages on the walls of Meah Shearim. Later, an anonymous pamphlet entitled Kol Ha-Shofar appeared containing a declaration signed by rabbis Sonnenfeld, Diskin and others saying: "We were astonished to see and hear gross things, foreign to the entire Torah, and we see that which we feared before his coming here, that he will introduce new forms of deviance that our rabbis and ancestors could not have imagined …. It is to be deemed a sorcerer's book? If so, let it be known that it is forbidden to study [let alone] rely on all his nonsense and dreams." It also quoted Aharon Rokeach of Belz who stated "And know that the rabbi from Jerusalem, Kook – may his name be blotted out – is completely wicked and has already ruined many of our youth, entrapping them with his guileful tongue and impure books." Returning to Poland after a visit to Palestine in 1921, Rabbi Avraham Mordechai Alter of Ger wrote that he endeavoured to calm the situation by getting Kook to renounce any expressions which may have unwittingly resulted in a profanation of God's name. He then approached the elder rabbis of the Yishuv asking them to withdraw their denunciation. The rabbis claimed that their intention had been to reach a consensus on whether Kook's writings were acceptable, but their letter had been surreptitiously inserted by Kook's critics in to their inflammatory booklet without their knowledge.
In 1926 a harsh proclamation was issued against Kook that contained letters from three European rabbis in which Yosef Rosin referred to him as an "ignorant bore", Shaul Brach intimated that his Hebrew initials spelt the word "vomit" and likened him to King Jeroboam known for seducing the masses to idolatry, and Eliezer David Greenwald declared him an untrustworthy authority on Jewish law adding that his books were full of heresy and should be burnt.
Support from rabbinic scholars
Although it seems that many Orthodox rabbis opposed Rabbi Kook, there were many who spoke out in his support.
In a 1921 letter, Rav Zvi Pesach Frank noted that "(t)he Gaon, our Master RAY Hakohen Kook (may he live) was accepted here as Rav by the majority of the Holy Community here." (Rabbi Chaim Hirschensohn, Malki Ba-Kodesh IV (St. Louis: Moinester Printing Co., 5679 – 5682), Letter 10 (dated 18 Adar Sheni, 5681, 1921), pp. 43–44)
The Gerrer Rebbe, the Imrei Emes, said in a letter about Rav Kook that "most of the inhabitants of the Holy City and many of the rabbis side with him" (originally published in "Der Jud", the Warsaw newspaper of the Agudah, May 27, June 3, and June 10, 1921 issues, partially republished in "Algemeiner Journal" (June 5, 1992) and republished in Orot translated by Bezalel Naor, page 28 in 1993 edition) and verified Rav Kook's righteousness and Torah scholarship, despite disagreeing strongly with certain of his religious philosophies regarding secular Zionists.
In a letter to Rabbi Kook, Rabbi Isser Zalman Meltzer and Rabbi Moshe Mordechai Epstein greeted Rabbi Kook with "Our honored friend, the great gaon and glory of the generation, our master and teacher, Avraham Yitzchak Hacohen, shlita". Meltzer was also quoted as saying "Let them, any of us, pray on Yom Kippur the way Rav Kook prays on an average weekday."
Rabbi Isser Zalman Meltzer also once said to the famed Rabbi Chaim Ozer Grodzinsky from Vilna, "The two of us are considered Torah giants until we reach the door of Rabbi Kook’s office." (cited by Rabbi Eliezer Melamed, Israel National News, August 8, 2013).
There are also some rabbis who spoke very highly of Kook in greetings of the letters they sent to him.
Chaim Ozer Grodzinski: "Our friend, the gaon, our master and teacher, Rabbi Avraham Yitzchak Kook, shlita" and "The Glory of Honor, My Dear Friend, Ha-Rav Ha-Gaon, Ha-Gadol, the Famous One... The Prince of Torah, Our Teacher, Ha-Rav Avraham Yitzchak Ha-Cohen Kook Shlita..."
Resources
Writings
Orot – organized and published by Rabbi Zvi Yehuda Kook, 1920. English translation by Bezalel Naor (Jason Aronson, 1993). ISBN 1-56821-017-5
Orot HaTeshuvah – English translation by Ben-Zion Metzger (Bloch Pub. Co., 1968). ASIN B0006DXU94
Orot HaEmuna
Orot HaKodesh – four volumes, organized and published by Rabbi David Cohen
Orot HaTorah – organized and published by Rabbi Zvi Yehuda Kook, 1940.
Chavosh Pe'er – on the mitzvah of tefillin. First printed in Warsaw, 1890.
Eder HaYakar and Ikvei HaTzon – essays about the new generation and a philosophical understanding of God. First printed in Jaffa in 1906.
Ein Ayah – commentary on Ein Yaakov the Aggadic sections of the Talmud. Printed in Jerusalem, 1995.
Ma'amarei HaRe'iyah (two volumes) – a collection of articles and lectures, many originally published in various periodicals. Printed in Jerusalem, 1984.
Midbar Shur – sermons written by Rav Kook while serving as a rabbi in Zaumel and Boisk in 1894–1896.
Reish Millin – Kabbalistic discussion of the Hebrew alphabet and punctuation. Printed in London, 1917.
Be'er Eliyahu – on Hilchos Dayanim
Orach Mishpat – Shu"t on Orach Chayim
Ezrat Cohen – Shu"t on Even HaEzer
Translation and commentary
(translation), Abraham Isaac Kook: The Lights of Penitence, The Moral Principles, Lights of Holiness, Essays, Letters, and Poems, Ben Zion Bokser, Paulist Press 1978. ISBN 0-8091-2159-X [Includes complete English translations of Orot ha-Teshuva ("The Lights of Penitence"), Musar Avicha ("The Moral Principles"), as well as selected translations from Orot ha-Kodesh ("The Lights of Holiness") and miscellaneous essays, letters, and poems.]
Samson, David; Tzvi Fishman (1996). Lights Of Orot. Jerusalem: Torat Eretz Yisrael Publications. ISBN 965-90114-0-7.
Samson, David; Tzvi Fishman (1997). War and Peace. Jerusalem: Torat Eretz Yisrael Publications. ISBN 965-90114-2-3.
Samson, David; Tzvi Fishman (1999). The Art of T'Shuva. Jerusalem: Beit Orot Publications. ISBN 965-90114-3-1. Online edition.
(translation), The Essential Writings of Abraham Isaac Kook, Ben Yehuda Press 2006 (reprint). ISBN 0-9769862-3-X
Rabbi Chanan Morrison, Gold from the Land of Israel: A New Light on the Weekly Torah Portion From the Writings of Rabbi Abraham Isaac HaKohen Kook, Urim Publications 2006. ISBN 965-7108-92-6.
Rabbi Chanan Morrison, Silver from the Land of Israel: A New Light on the Sabbath and Holidays From the Writings of Rabbi Abraham Isaac HaKohen Kook, Urim Publications 2010. ISBN 965-524-042-8.
Rabbi Chanan Morrison, The Splendor of Tefillin: Insights into the Mitzvah of Tefillin from the Writings of Rabbi Abraham Isaac HaKohen Kook, CreateSpace 2012. ISBN 148-001-997-6.
Rabbi Chanan Morrison, Sapphire from the Land of Israel: A New Light on the Weekly Torah Portion From the Writings of Rabbi Abraham Isaac HaKohen Kook, CreateSpace 2013. ISBN 149-090-936-2.
Analysis
The Philosophy of Rabbi Kook, Zvi Yaron, Eliner Library, 1992.
Essays on the Thought and Philosophy of Rabbi Kook, ed. Ezra Gellman, Fairleigh Dickinson University Press, 1991. ISBN 0-8386-3452-4
The World of Rav Kook's Thought, Shalom Carmy, Avi-Chai Publishers, 1991. ISBN 0-9623723-2-3
Rav Avraham Itzhak HaCohen Kook: Between Rationalism and Mysticism, Benjamin Ish-Shalom, translation Ora Wiskind Elper, SUNY Press, 1993. ISBN 0-7914-1369-1
Religious Zionism of Rav Kook Pinchas Polonsky, Machanaim, 2009, ISBN 978-965-91446-0-0
Rabbi Abraham Isaac Kook and Jewish Spirituality , Lawrence J. Kaplan & David Shatz, NYU Press, 1994, ISBN 978-0814746530
Ghila Amati, "Discovering the Depths Within: Kook’s Zionism and the Philosophy of Life of Henri Bergson," Religions 2023, 14(2), 261; Discovering the Depths Within: Kook’s Zionism and the Philosophy of Life of Henri Bergson
Ghila Amati, "Freedom, Creativity, the Self, and God: Between Rabbi Kook and Bergson’s Lebensphilosophie," 'Harvard Theological Review' 2024, 117(3):558–582. doi:10.1017/S0017816024000221
Ephraim Chamiel, The Dual Truth – Studies in Nineteenth-Century Modern Religious Thought and its Influence on Twentiest-Century Jewish Philosophy, Academic Studies Press, Boston 2019, Vol II, pp. 449–499.
Ephraim Chamiel, Between Religion and Reason – The Dialectic Position in Contemporary Jewish Thought, Academic Studies Press, Boston 2020, part I, pp. 7–15.
Dov Schwartz, The Religious Genius in Rabbi Kook's Thought: National "Saint"? Boston: Academic Studies Press 2014. ISBN 978-1618114112
Biography
Simcha Raz, Angel Among Men: Impressions from the Life of Rav Avraham Yitzchak Hakohen Kook Zt""L, translated (from Hebrew) Moshe D. Lichtman, Urim Publications 2003. ISBN 965-7108-53-5 ISBN 978-9657108536
Dov Peretz Elkins, Shepherd of Jerusalem: A Biography of Rabbi Abraham Isaac Kook, 2005. ISBN 978-1420872613
Yehudah Mirsky, An Intellectual and Spiritual Biography of Rabbi Avraham Yitzhaq Ha-Cohen Kook from 1865 to 1904, PhD Dissertation, Harvard University, 2007.
Yehudah Mirsky, Rav Kook: Mystic in a Time of Revolution (Jewish Lives), Yale University Press, 2014, ISBN 978-0300164244
Quotes
Therefore, the pure righteous do not complain of the dark, but increase the light; they do not complain of evil, but increase justice; they do not complain of heresy, but increase faith; they do not complain of ignorance, but increase wisdom.
There could be a freeman with the spirit of the slave, and there could be a slave with a spirit full of freedom; whoever is faithful to himself – he is a freeman, and whoever fills his life only with what is good and beautiful in the eyes of others – he is a slave.



