The world is populated in the main by people who should not exist

I enjoy convalescence. It is the part that makes the illness worth while.

Make it a rule never to give a child a book you would not read yourself.

You don't learn to hold your own in the world by standing on guard, but by attacking, and getting well hammered yourself.

Fashions are induced epidemics.

The capacity of any conqueror is more likely than not to be an illusion produced by the incapacity of his adversary.

You do not settle whether an argument is justified by merely showing that it is of some use. The distinction is not between useful and useless experiments but between barbarous and civilized behaviour. Vivisection is a social evil because if it advances human knowledge, it does so at the expense of human character.