In this long-awaited volume, on which he worked for twenty years, Mr. Wolfson describes the body of doctrine known as the Kalam. Kalam, an Arabic term meaning "speech" and hence "discussion," was applied to early attempts in Islam to adduce philosophic proofs for religious beliefs. It later came to designate a system of religious philosophy which reached its highest point in the eleventh century; the masters of Kalam, known as Mutakallimun, were in many respects the Muslim equivalent of the Christian Church Fathers. Mr. Wolfson studies the Kalam systematically, unfolding its philosophic origins and implications and observing its repercussions in other religions. He scrutinizes the texts of Muslim writers for their treatment of such crucial problems as the attributes of God, the Creation, causality, predestination and free will. In the process he shows how the teachings of the Koran were constantly interwoven with ideas from Greek and Oriental philosophies, Judaism, and Christianity as Islamic thought developed.