If two hitherto rival football teams, under the influence of brotherly love, decided to co-operate in placing the football first beyond one goal and then beyond the other, no one's happiness would be increased

All movements go too far.

Pure mathematics consists entirely of assertions to the effect that, if such and such a proposition is true of anything, then suchand such another proposition is true of that thing.... Thus mathematics may be defined as the subject in which we never know what we are talking about, nor whether what we are saying is true.

To create a healthy philosophy you should renounce metaphysics but be a good mathematician.

Fear is the parent of cruelty, and therefore it is no wonder if cruelty and religion go hand in hand.

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

When the intensity of emotional conviction subsides, a man who is in the habit of reasoning will search for logical grounds in favour of the belief which he finds in himself.