Let us not forget what befits our present state in the pursuit of vain fancies. Mankind has its place in the sequence of things; childhood has its place in the sequence of human life; the man must be treated as a man and the child as a child. Give each his place, and keep him there. Control human passions according to man's nature; that is all we can do for his welfare. The rest depends on external forces, which are beyond our control.

Emile, or On Education (1762) - Book II