What we want is to see the child in pursuit of knowledge, and not knowledge in pursuit of the child.

Treat a friend as a person who may someday become your enemy; an enemy as a person who may someday become your friend.

Vivisection is a social evil because if it advances human knowledge, it does so at the expense of human character.

You must all know half a dozen people at least who are no use in this world, who are more trouble than they are worth. Just put them there and say Sir, or Madam, now will you be kind enough to justify your existence? If you can't justify your existence, if you're not pulling your weight in the social boat, if you're not producing as much as you consume or perhaps a little more, then, clearly, we cannot use the organizations of our society for the purpose of keeping you alive, because your life does not benefit us and it can't be of very much use to yourself.

He who can, does. He who cannot, teaches.

If I bind the future I bind my will. If I bind my will I strangle creation.

Two people getting together to write a book is like three people getting together to have a baby. One of them is superfluous.