The purpose of this book is to give, through a diligent selection of Einstein's writings, a concise, but clear and unified representation of his scientific doctrines and philosophical conceptions. His writings are not many: short memoirs, a few fairly succinct essays, lectures and interviews, are all that can be drawn upon to form a concrete picture of his philosophy and his attitude toward life. In order to allow the non-specialized reader to understand the essence and value of the theori...