It is unwise to be too sure of one's own wisdom. It is healthy to be reminded that the strongest might weaken and the wisest might err.

I claim to be a simple individual liable to err like any other fellow mortal. I own, however, that I have humility enough in me to confess my errors and to retrace my steps.

Healthy discontent is the prelude to progress.

If a man reaches the heart of his own religion, he has reached the heart of the others, too. There is only one God, and there are many paths to him.

Peace is its own reward.

Live as if your were to die tomorrow. Learn as if you were to live forever.