Each day is a little life.

I observed once to Goethe that when a friend is with us we do not think the same of him as when he is away. He replied, "Yes! because the absent friend is yourself, and he exists only in your head; whereas the friend who is present has an individuality of his own, and moves according to laws of his own, which cannot always be in accordance with those which you form for yourself.

In early youth, as we contemplate our coming life, we are like children in a theatre before the curtain is raised, sitting there in high spirits and eagerly waiting for the play to begin.

Reasonable and vicious are quite consistent with each other, in fact, only through their union are great and far-reaching crimes possible

Anyone can squash a bug but all professors of this world couldn't build one.

Every original idea is first ridiculed, then vigorously attacked, and finally taken for granted.

Opinion is like a pendulum and obeys the same law.