By profession a biologist, [Thomas Henry Huxley] covered in fact the whole field of the exact sciences, and then bulged through its four fences. Absolutely nothing was uninteresting to him. His curiosity ranged from music to theology and from philosophy to history. He didn't simply know something about everything; he knew a great deal about everything.

Jealousy is the theory that some other fellow has just as little taste.

It is the dull man who is always sure, and the sure man who is always dull.

The Christian church, in its attitude toward science, shows the mind of a more or less enlightened man of the Thirteenth Century. It no longer believes that the earth is flat, but it is still convinced that prayer can cure after medicine fails.

The intelligent, like the unintelligent, are responsive to propaganda.

A free citizen in a free state, it seems to me, has an inalienable right to play with whomsoever he will, so long as he does not disturb the general peace. If any other citizen, offended by the spectacle, makes a pother, then that other citizen, and not the man exercising his inalienable right, should be put down by the police.

The ideal way to get rid of any infectious disease would be to shoot instantly every person who comes down with it.