Never feel remorse for what you have thought about your wife; she has thought much worse things about you.
The biologist passes. The frog stays the same.
To love an idea is to love it a little more than one should.
Greatness, in order to gain recognition, must all too often consent to ape greatness.
What makes our opponents useful is that they allow us to believe that without them we would be able to realize our goals.
Kill one man, and you are a murderer. Kill millions of men, and you are a conqueror. Kill them all, and you are a god.