Never hold discussions with the monkey when the organ grinder is in the room.
Humor is the only test of gravity, and gravity of humor; for a subject which will not bear raillery is suspicious, and a jest which will not bear serious examination is false wit.
History is indeed little more than the register of the crimes, follies and misfortunes of mankind.
When we ask for advice, we are usually looking for an accomplice.
Use what you have to run toward your best - that's how I now live my life.
The bitterest tears shed over graves are for words left unsaid and deeds left undone.
Everything of importance has been said before by somebody who did not discover it.