Where so many hours have been spent in convincing myself that I am right, is there not some reason to fear I may be wrong?
There is only one thing a philosopher can be relied upon to do, and that is to contradict other philosophers.
The most exciting phrase to hear in science, the one that heralds new discoveries, is not 'Eureka!' (I found it!) but 'That's funny ...'
It is not enough to aim; you must hit.
Everybody likes a kidder, but nobody lends him money.
I am free of all prejudice. I hate everyone equally.
All that is human must retrograde if it does not advance.