Of all the animals, man is the only one that lies.

Some things you can't find out; but you will never know you can't by guessing and supposing: no, you have to be patient and go on experimenting until you find out that you can't find out.

Tell the truth or trump-but get the trick.

So you see, the quality of humor is not a personal or a national monopoly. It's as free as salvation, and, I am afraid, far more widely distributed. But it has its value, I think. The hard and sordid things of life are too hard and too sordid and too cruel for us to know and touch them year after year without some mitigating influence, some kindly veil to draw over them, from time to time, to blur the craggy outlines, and make the thorns less sharp and the cruelties less malignant.

If the metrics you are looking at aren't useful in optimizing your strategy - stop looking at them.

He has been a doctor a year now and has had two patients - no, three, I think - yes, it was three; I attended their funerals.

One day man by the slow processes of evolution shall develop into something really fine and high - some billions of years hence, say.