Being alone when one's belief is firm, is not to be alone.

All men are selfish, but the vain man is in love with himself. He admires, like the lover his adored one, everything which to others is indifferent.

What is all our knowledge worth? We do not even know what the weather will be tomorrow.

The vain being is the really solitary being.

Weak men are easily put out of humor. Oil freezes quicker than water.

Only he is free who cultivates his own thoughts and strives without fear to do justice to them.

With hat in hand, one gets on in the world.