I know nothing more mocking than a devil that despairs.

Beware of dissipating your powers; strive constantly to concentrate them.

I wait for the morning of my tears

A flippant, frivolous man may ridicule others, may controvert them, scorn them; but he who has any respect for himself seems to have renounced the right of thinking meanly of others.

All intelligent thoughts have already been thought; what is necessary is only to try to think them again.

Nothing is more consonant with Nature than that she puts into operation in the smallest detail that which she intends as a whole.

Let everyone sweep in front of his own door, and the whole world will be clean.