To be free is nothing, to become free is everything.

Nothing great in the world has ever been accomplished without passion.

Mark this well, you proud men of action! you are, after all, nothing but unconscious instruments of the men of thought.

To him who looks upon the world rationally, the world in its turn presents a rational aspect. The relation is mutual.

The learner always begins by finding fault, but the scholar sees the positive merit in everything.

All that is real is reasonable, and all that is reasonable is real.