The man who can keep a secret may be wise, but he is not half as wise as the man with no secrets to keep.

I express many absurd opinions. But I am not the first man to do it; American freedom consists largely in talking nonsense.

I declare my belief that it is not your duty to do anything that is not to your own interest. Whenever it is unquestionably your duty to do a thing, then it will benefit you to perform that duty.

If you want to know how old a woman is . . . ask her sister-in-law.

A reasonable probability is the only certainty.

You needn't love your enemy, but if you refrain from telling lies about him, you are doing well enough.

The man who can keep a secret may be wise, but he is not half as wise as the man with no secrets to keep.