Book VIII · 28

Pain is either an evil to the body—then let the body say what it thinks of it—or to the soul; but it is in the power of the soul to maintain its own serenity and tranquillity, and not to think that pain is an evil. For every judgment and movement and desire and aversion is within, and no evil ascends so high.

Pain is an evil either to the body—let the body then denounce it —or to the Soul; but the Soul can ensure her own fair weather and her own calm sea, and refuse to account it an evil. For every conviction and impulse and desire and aversion is from within, and nothing climbs in thither.