Nothing shows a man's character more than what he laughs at.

No pessimist ever discovered the secrets of the stars, or sailed to an uncharted land, or opened a new heaven to the human spirit.

The soul should always stand ajar, ready to welcome the ecstatic experience.

We all know that there are these exemplars who can take the toughest students, and they'll teach them two-and-a-half years of math in a single year.

We should feel sorrow, but not sink under its oppression.