The man who is anybody and who does anything is surely going to be criticized, vilified, and misunderstood. This is a part of the penalty for greatness, and every great man understands it; and understands, too, that it is no proof of greatness. The final proof of greatness lies in being able to endure contumely without resentment.

Never explain - your friends do not need it and your enemies will not believe you anyway.

Genius is the ability to act rightly without precedent - the power to do the right thing the first time.

Growth is often a painful process.

Reason: The arithmetic of the emotions.

The world is moving so fast these days that the man who says it can't be done is generally interrupted by someone doing it.

Piety is the tinfoil of pretense.