When the outer man is somewhat subdued, let the inner man be somewhat refreshed; and when bodily excess is denied to our flesh, let our mind be invigorated by spiritual delights. Let every Christian scrutinise himself, and search severely into his inmost heart: let him see that no discord cling there, no wrong desire be harboured. Let chasteness drive incontinence far away; let the light of truth dispel the shades of deception; let the swellings of pride subside; let wrath yield to reason; let the darts of ill-treatment be shattered, and the chidings of the tongue be bridled; let thoughts of revenge fall through, and injuries be given over to oblivion.
Leo the Great, Sermon 39 (Sermon on Lent I)