The mere pursuit of health always leads to something unhealthy. Physical nature must not be made the direct object of obedience; it must be enjoyed, not worshipped. Stars and mountains must not be taken seriously. If they are, we end where the pagan nature worship ended. Because the earth is kind, we can imitate all her cruelties. Because sexuality is sane, we can all go mad about sexuality. Mere optimism had reached its insane and appropriate termination. The theory that everything was good had become an orgy of everything that was bad.
Orthodoxy, G. K. Chesterton