Kehot 1979,3rd revised edition 1988. Aryeh Kaplan, "Paradoxes", in "The Aryeh Kaplan Reader", Artscroll 1983. Aryeh Kaplan, "Innerspace", Moznaim Pub. Corp. 1990. Aryeh Kaplan Understanding God , Ch2. in "The Handbook of Jewish Thought", Moznaim 1979. External links Tzimtzum: A Primer, chabad.org Tanya, Shaar HaYichud VehaEmunah Shneur Zalman of Liadi—see Lessons in Tanya, chabad.org Shaar HaYichud - The Gate of Unity , Dovber Schneuri — a detailed explanation of the concept of Tzimtzum. Veyadaata - To Know G-d, Sholom Dovber Schneersohn, a Hasidic discourse on the paradox of Tzimtzum inner.org, "Basics in Kabbalah and Chassidut" Tanya: Tzimtzum and armony of economy in the world with Tzedakah (www.chabad.org) Jewish mysticism Kabbalistic words and phrases Isaac Luria