Freedom of opinion can only exist when the government thinks itself secure.

Few people can be happy unless they hate some other person, nation, or creed.

If there were in the world today any large number of people who desired their own happiness more than they desired the unhappiness of others, we could have paradise in a few years.

Anything you're good at contributes to happiness.

Men who are unhappy, like men who sleep badly, are always proud of the fact.

The secret of happiness is this: let your interests be as wide as possible, and let your reactions to the things and persons that interest you be as far as possible friendly rather than hostile.

To be without some of the things you want is an indispensable part of happiness.

The good life, as I conceive it, is a happy life. I do not mean that if you are good you will be happy; I mean that if you are happy you will be good.

A hallucination is a fact, not an error; what is erroneous is a judgment based upon it.

A process which led from the amoebae to man appeared to the philosophers to be obviously a progress -- though whether the amoebae would agree with this opinion is not known.