Reason is like an open secret that can become known to anyone at any time; it is the quiet space into which everyone can enter through his own thought

There is no God, cry the masses more and more vociferously; and with the loss of God man loses his sense of values — is, as it were, massacred because he feels himself of no account.

My own being can be judged by the depths I reach in making these historical origins my own.

Only then, approaching my fortieth birthday, I made philosophy my life's work.

What is meaningful cannot in fact be isolated…. We achieve understanding within a circular movement from particular facts to the whole that includes them and back again from the whole thus reached to the particular significant facts.

Man is always something more than what he knows of himself. He is not what he is simply once and for all, but is a process; he is not merely an extant life, but is, within that life, endowed with possibilities through the freedom he possesses to make of himself what he will by the activities on which he decides.

As a universal history of philosophy, the history of philosophy must become one great unity.