To be blind is bad, but worse is to have eyes and not see.

To me a lush carpet of pine needles or spongy grass is more welcome than the most luxurious Persian rug.

Toleration is the greatest gift of the mind.

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

It is certain that I cannot always distinguish my own thoughts from those I read, because what I read becomes the very substance and text of my mind.

What induces a child to learn but his delight in knowing?

A good education is a stepping-stone to wealth.