Since the great foundation of fear is pain, the way to harden and fortify children against fear and danger is to accustom them to suffer pain.
John LockeTo be rational is so glorious a thing, that two-legged creatures generally content themselves with the title.
John LockeFrom whence it is obvious to conclude that, since our Faculties are not fitted to penetrate into the internal Fabrick and real Essences of Bodies; but yet plainly discover to us the Being of a GOD, and the Knowledge of our selves, enough to lead us into a full and clear discovery of our Duty, and great Concernment, it will become us, as rational Creatures, to imploy those Faculties we have about what they are most adapted to, and follow the direction of Nature, where it seems to point us out the way.
John Locke