Already at the origin of the species man was equal to what he was destined to become.

We find it easy to believe that praise is sincere: why should anyone lie in telling us the truth?

To reflect is to disturb one's thoughts.

The biologist passes. The frog stays the same.

Never feel remorse for what you have thought about your wife; she has thought much worse things about you.

Science had better not free the minds of men too much, before it has tamed their instincts.

Renown? I've already got more of it than those I respect, and will never have as much as those for whom I feel contempt.