Prudence reproaches; conscience accuses.

No state at war with another state should engage in hostilities of such a kind as to render mutual confidence impossible when peace will have been made.

Do what is right, though the world may perish.

God, freedom, and immortality are untenable in the light of pure reason.

We can never, even by the strictest examination, get completely behind the secret springs of action.

The desire which a man has for a woman is not directed towards her because she is a human being, but because she is a woman ; that she is a human being is of no concern to the man; only her sex is the object of his desires.

The instruction of children should aim gradually to combine knowing and doing. Among all sciences mathematics seems to be the only one of a kind to satisfy this aim most completely.