I began the study of medicine, impelled by a desire for knowledge of facts and of man. The resolution to do disciplined work tied me to both laboratory and clinic for a long time to come.

Greatness of mind becomes an object of love only when the power at work in it itself has a noble character

Only as an individual can man become a philosopher.

The moment is the sole reality.

Philosophic meditation is an accomplishment by which I attain Being and my own self, not impartial thinking which studies a subject with indifference.

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.

If philosophy is practice, a demand to know the manner in which its history is to be studied is entailed: a theoretical attitude toward it becomes real only in the living appropriation of its contents from the texts.