Bertrand Russell — "What men want is not knowledge but certainty."

"The most fundamental of all moral duties is to exercise our intelligence to the utmost."

"The universe may have a purpose, but no detectable purpose."

"Aristotle maintained that women have fewer teeth than men; although he was twice married, it never occurred to him to verify this statement by examining his wives' mouths."

"The sections that are dwindling include the whole middle-class and the skilled artisans. The sections that are increasing are the very poor, the shiftless and drunken, the feeble-minded—feeble-minded …"

"I am firmly convinced that the better we know the world, the less we shall be inclined to believe in God and immortality."