To do what is impossible for talent is the mark of genius.

The mind must have for ballast the clear conception of duty, if it is not to fluctuate between levity and despair.

Thought is a kind of opium; it can intoxicate us, while still broad awake; it can make transparent the mountains and everything that exists.

What we call little things are merely the causes of great things.

Latent genius is but a presumption. Everything that can be, is bound to come into being, and what never comes into being is nothing.

For purposes of action nothing is more useful than narrowness of thought combined with energy of will.

In order to see Christianity, one must forget all the Christians.