A man's friendships are one of the best measures of his worth.

At some future period, not very distant as measured by centuries, the civilized races of man will almost certainly exterminate, and replace the savage races throughout the world.

A man who dares to waste one hour of time has not discovered the value of life.

The very essence of instinct is that it's followed independently of reason.

How paramount the future is to the present when one is surrounded by children.

False facts are highly injurious to the progress of science, for they often endure long; but false views, if supported by some evidence, do little harm, for every one takes a salutary pleasure in proving their falseness.

I love fools' experiments. I am always making them.

A man who dares to waste one hour of time has not discovered the value of life.

I cannot persuade myself that a beneficent and omnipotent God would have designedly created parasitic wasps with the express intention of their feeding within the living bodies of Caterpillars.

If the misery of the poor be caused not by the laws of nature, but by our institutions, great is our sin.