"What the heart is to the body, the Jewish people are to the world," wrote Rabbi Yehuda Halevy, author of the Kuzari. This philosophical work is written as a dialogue between a rabbi and the 8th century king of the Khazars. Between "the king's" relentless questions and "the rabbi's" meticulous answers emerges a picture of a religion of joy, accomplishment, and universal love of mankind.