The Americans have need of the telephone, but we do not. We have plenty of messenger boys.
There is always more misery among the lower classes than there is humanity in the higher.
If you would thoroughly know anything, teach it to others.
Being in politics is like being a football coach. You have to be smart enough to understand the game, and dumb enough to think it's important.
Nothing can be so amusingly arrogant as a young man who has just discovered an old idea and thinks it is his own.
Never eat more than you can lift.
The secret of greatness is simple: do better work than any other man in your field - and keep on doing it.