Each ten years of a man's life has its own fortunes, its own hopes, its own desires.

It is a great error to take oneself for more than one is, or for less than one is worth.

Whoever, in middle age, attempts to realize the wishes and hopes of his early youth, invariably deceives himself. Each ten years of a man's life has its own fortunes, its own hopes, its own desires.

Patriotism ruins history.

To be active is the primary vocation of man.

Generosity wins favour for everyone, especially when it is accompanied by modesty.

Whether one show one's self a man of genius in science or compose a song, the only point is, whether the thought, the discovery, the deed, is living and can live on.