The present volume is a translation of his last book, Emune un Apikorses, published in 1948. It is a sustained attack on the philosophy of materialism, in all its historical versions, from the Greek to modern times--including the Marxist version, to which Agushewitz had been attracted as a youth. Though a highly original work of philosophy (perhaps the only original work of philosophy ever written in Yiddish), it contains valuable discussions of some of the greatest Western philosophers, including the great Greek atomists; Zeno; Aristotle; Descartes; Spinoza; Kant; Bergson; Russell; and many others. This translation will rescue this outstanding philosopher and Yiddish writer from the obscurity which has enveloped him for over half a century.