Every man has his moral backside which he refrains from showing unless he has to and keeps covered as long as possible with the trousers of decorum.

The worst thing you can possibly do is worrying and thinking about what you could have done.

There is no greater impediment to progress in the sciences than the desire to see it take place too quickly.

It is almost everywhere the case that soon after it is begotten the greater part of human wisdom is laid to rest in repositories.

If it were true what in the end would be gained? Nothing but another truth. Is this such a mighty advantage? We have enough old truths still to digest, and even these we would be quite unable to endure if we did not sometimes flavor them with lies.

Some people come by the name of genius in the same way that certain insects come by the name of centipede -- not because they have a hundred feet, but because most people can't count above 14.

Man can acquire accomplishments or he can become an animal, whichever he wants. God makes the animals, man makes himself.