"MAN is a creature; all his happiness consists in being a creature; or, as the Great Voice commanded us, in becoming a child. All his fun is in having a gift or present; which the child, with profound understanding, values because it is 'a surprise'. But surprise implies that a thing comes from outside ourselves; and gratitude that it comes from someone other than ourselves. It is thrust through the letter-box; it is thrown in at the window; it is thrown over the wall. Those limits are the lines of the very plan of human pleasure."
~G.K. Chesterton: The Poet and the Lunatics.