Half the useful work in the world consists of combating the harmful work.

There are infinite possibilities of error, and more cranks take up fashionable untruths than unfashionable truths.

Every living thing is a sort of imperialist, seeking to transform as much as possible of its environment into itself.

What has human happiness to do with morals? The object of morals is not to make people happy.

To expect a personality to survive the disintegration of the brain is like expecting a cricket club to survive when all of its members are dead.

I do not think any reasonable person can doubt that in India, China and Japan, if the knowledge of birth control existed, the birthrate would fall very rapidly

Most political leaders acquire their position by causing large numbers of people to believe that these leaders are actuated by altruistic desires