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.

    In Israel, the organization is commonly called Etzel, based on its Hebrew acronym. The book traces the development of the Irgun from its early days in the 1930s, through its years of violent struggle in the Palestine Mandate against both British rule (the "revolt" of the title) and Arab opposition, to the outbreak of the Israeli War of Independence in 1948. The book is also part autobiographical, tracing Begin's own political development. First published in English in 1951 by W. H. Allen.