Great men are the real men, in them nature has succeeded.

Philosophy means the complete liberty of the mind.

Nature does at least what she can to translate into visible form the wealth of the creative formula. By the vastness of the abysses into which she penetrates, in the effort--the unsuccessful effort--to house and contain the eternal thought, we may measure the greatness of the divine mind.

Life is but a daily oscillation between revolt and submission.

A man only understands what is akin to something already existing in himself.

It is by teaching that we teach ourselves, by relating that we observe, by affirming that we examine, by showing that we look, by writing that we think, by pumping that we draw water into the well.

Happiness gives us the energy which is the basis of health.