Originally published in Judaism: A Quarterly Journal of Jewish Life and Thought, 25:4 (1976). Concepts of Judaism. By ISAAC BREUER. Selected and edited by Jacob S. Levinger. Jerusalem. Israel Universities Press, 1974. 348 pp. Reviewed by LOUIS JACOBS PROFESSOR LEVINGER believes, with justice, that the writings of Isaac Breuer (1883-1946), grandson, and exponent of the ideas,…