The resistance to a new idea increases by the square of its importance.

For love of domination we must substitute equality; for love of victory we must substitute justice; for brutality we must substitute intelligence; for competition we must substitute cooperation. We must learn to think of the human race as one family.

No Carthaginian denied Moloch, because to do so would have required more courage that was required to face death in battle.

To be able to fill leisure intelligently is the last product of civilization, and at present very few people have reached this level.

The doctrine (of) maintaining that the language of daily life, with words used in their ordinary meanings, suffices for philosophy . . . I find myself totally unable to accept . . . . Because it makes almost inevitable the perpetuation amongst philosophers of the muddle-headedness they have taken over from common sense.

When Benjamin Franklin invented the lightning-rod, the clergy, both in England and America, with enthusiastic support of George III, condemned it as an impious attempt to defeat the will of God.

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