When I was young, I observed that nine out of ten things I did were failures. So I did ten times more work.

Those who understand the steam engine and the electric telegraph spend their lives in trying to replace them with something better.

Reformers have the idea that change can be achieved by brute sanity.

There may be some doubt as to who are the best people to have charge of children, but there can be no doubt that parents are the worst.

I don't know if there are men on the moon, but if there are they must be using the earth as their lunatic asylum

Just do what must be done. This may not be happiness, but it is greatness.

We should all be obliged to appear before a board every five years and justify our existence... on pain of liquidation.