It's my opinion that every one I know has morals, though I wouldn't like to ask. I know I have. But I'd rather teach them than practice them any day. "Give them to others"-that's my motto.

A human being has a natural desire to have more of a good thing than he needs.

Who are we to create a heaven and hell for ourselves, excluding animals and plants in the bargain, just because we have the power to rationalize?

...we all know that in all matters of mere opinion that [every] man is insane-just as insane as we are...we know exactly where to put our finger upon his insanity: it is where his opinion differs from ours....All Democrats are insane, but not one of them knows it. None but the Republicans. All the Republicans are insane, but only the Democrats can perceive it. The rule is perfect: in all matters of opinion our adversaries are insane.

Love is madness, if thwarted it develops fast.

His ignorance covers the world like a blanket, and there's scarcely a hole in it anywhere.

Medicine has made all its progress during the past fifty years. ... How many operations that are now in use were known fifty years ago?-they were not operations, they were executions.