It is work, work that one delights in, that is the surest guarantor of happiness. But even here it is a work that has to be earned by labor in one's earlier years. One should labor so hard in youth that everything one does subsequently is easy by comparison.

The only measure of what you believe is what you do. If you want to know what people believe, don't read what they write, don't ask what they believe, just observe what they do.

Girls marry for love. Boys marry because of a chronic irritation that causes them to gravitate in the direction of objects with certain curvilinear properties.

You certainly can't tell anything from the microscopic structure of the brain whether the person was an idiot or a genius.

Children are the most learning-hungry beings in the world.

The measure of man's humanity is the extent and intensity of his love for mankind.

No one should be required to see America for the first time.