"A mother tells her infant, that 'two and two make four'; the child remembers the proposition, and is able to count four to all the purposes of life, till the course of his education brings him among philosophers, who fright him from his former knowledge, by telling him, that four is a certain aggregate of units; that all numbers being only the repetition of a unit, which, though not a number itself, is the parent, root, or original of all number, 'four' is the denomination assigned to a certain number of such repetitions. The only danger is, lest, when he first hears these dreadful sounds, the pupil should run away; if he has but the courage to stay till the conclusion, he will find that, when speculation has done its worst, two and two still make four." — Samuel Johnson