Search for the truth is the noblest occupation of man; its publication is a duty.
Happiness is a wondrous commodity: the more you give, the more you have.
Morality must guide calculation, and calculation must guide politics.
[To Bonaparte, when asked why she meddled in politics:] Sire, when women have their heads cut off, it is but just they should know the reason.
The life of famous men was more glorious in antiquity; the life of obscure men is happier with the moderns.
Speech happens to not be his language.