Abraham Lincoln

How many legs does a dog have if you call his tail a leg? Four. Saying that a tail is a leg doesn't make it a leg.

Ballots are the rightful and peaceful successors to bullets.

Give me six hours to chop down a tree and I will spend the first four sharpening the axe.

It is characteristic of science that the full explanations are often seized in their essence by the percipient scientist long in advance of any possible proof.

Well, I actually wrote her a letter a couple of days ago congratulating her. The tone I tried to convey in the letter is, look, you are a part of a great American historical process.

Nothing that is worth doing can be achieved in a lifetime; therefore we must be saved by hope.