Genius is that which forces the inertia of humanity to learn.

It seems that laughter needs an echo.

The vital spirit. L'élan vital

Wherever anything lives, there is, open somewhere, a register in which time is being inscribed.

The present contains nothing more than the past, and what is found in the effect was already in the cause.

I see plainly how external images influence the image that I call my body : they transmit movement to it.

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.