There are manifold tones of mental life, or, in other words, our psychic life may be lived at different heights, now nearer to action, now further removed from it, according to the degree of our attention to life.

The vital spirit. L'élan vital

For life is tendency, and the essence of a tendency is to develop in the form of a sheaf, creating, by its very growth, divergent directions among which its impetus is divided.

The major task of the twentieth century will be to explore the unconscious, to investigate the subsoil of the mind.

To exist is to change, to change is to mature, to mature is to go on creating oneself endlessly.

It is with our entire past ... that we desire, will and act ... from this survival of the past it follows that consciousness cannot go through the same state twice. The circumstances may still be the same, but they will act no longer on the same person ... that is why our duration is irreversible.

Only those ideas that are least truly ours can be adequately expressed in words.