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.

Only as an individual can man become a philosopher.

The moment is the sole reality.

A scientific approach means knowing what one knows and what one doesn't. Absolute or complete knowledge is unscientific.

What makes us afraid is our great freedom in the face of the emptiness that has still to be filled.

Conflicts may be the sources of defeat, lost life and a limitation of our potentiality but they may also lead to greater depth of living and the birth of more far-reaching unities, which flourish in the tensions that engender them.

To decide to become a philosopher seemed as foolish to me as to decide to become a poet.