He therefore who has died to the world -- for this is the cross -- and lives no longer himself, but it is Christ Who lives in him (Gal. 2:20); who has mortified his earthly members (Col. 3:5), that is, the passionate sensations of the body, such that he has become no longer a participant in any passion or evil lust: how, tell me, can he take in any kind of passionate sensation, or surrender to any movement of pleasure, or ever be troubled in his heart?

(Saint Symeon the New Theologian)