Boys and girls should be taught respect for each other's liberty... and that jealousy and possessiveness kill love.

Human nature being what it is, people will insist upon getting some pleasure out of life.

The fact that an opinion has been widely held is no evidence whatever that it is not utterly absurd.

The average man's opinions are much less foolish than they would be if he thought for himself.

People are zealous for a cause when they are not quite positive that it is true.

Ordinary language is totally unsuited for expressing what physics really asserts, since the words of everyday life are not sufficiently abstract. Only mathematics and mathematical logic can say as little as the physicist means to say.

My own view on religion is . . . It helped in early days to fix the calendar, and . . . to chronicle eclipses . . . These two services I am prepared to acknowledge.