In this brief yet profound meditation on the meaning of the Seventh Day, Heschel introduced the idea of an "architecture of holiness" that appears not in space but in time. Judaism, he argues, is a religion of time: it finds meaning not in space and the material things that fill it but in time and the eternity that imbues it, so that "the Sabbaths are our great cathedrals."

    Abraham Joshua Heschel's philosophy of religion is not a philosophy of doctrine or the interpretation of a dogma. He erects his carefully built structure of thought upon foundations which are universally valid but almost generally ignored. It was Man Is Not Alone which led Reinhold Niebuhr accurately to predict that Heschel would "become a commanding and authoritative voice not only in the Jewish community but in the religious life of America." With its companion volume, God in Search of Man, it is revered as a classic of modern theology.

    Without neglecting the scientific data provided by archaeological and philological research, he makes us conscious of the literary attributes of the Bible.Unlike the volumes dealing with the first two pericopes of Genesis, the present work does not separate the annotations from the Biblical text, but forms a continuous, unified commentary in which the Scriptural citations are interlinked with the exposition.