It is a matter of history that philosophies lose their freshness and that their concepts and systems become inadequate to the reality of nature, world and history and men’s consciousness of them. Their theoretical and moral doctrines grow stale and appear as empty formulae. Reality seems to escape their grasp and to demand spontaneously, as it were, a new effort to comprehend it. The thinking that claims to answer this demand must contradict existing systems, because it must begin by renouncing …