Laudator Temporis Acti

Augustine, Sermons 352.7 (Patrologia Latina, vol. 39, col. 15575; tr. Edmund Hill):

Tell me, though, when you pardon someone from your heart, what are you losing? When you pardon the person who sins against you, what will you have less of in your heart? It's from there, you see, that you are forgiving, but you're not giving anything away. On the contrary, indeed, a kind of wave of charity was sweeping over your heart, and so to say welling up from an inner spring; you nurse hatred against your brother, you have blocked up the source. So not only do you lose nothing when you pardon, but you are watered more abundantly than ever. Charity is not limited at all; you place a stone of offense there, and you're limiting yourself. "I'll get my own back, I'll get my revenge, I'll show him, I'll do it." You're all steamed up, you're wearing yourself out, when by granting him pardon you could be without a care in the world, live without a care in the world, pray without a care in the world.

Dic mihi, cum ignoscis de corde, quid perdis? Cum ignoscis ei qui peccat in te, quid minus habebis in corde tuo? Inde enim dimittis, sed nihil amittis. Immo vero unda quaedam caritatis ibat in corde tuo, et tamquam de vena interiore manabat: tenes odium contra fratrem, obturasti fontem. Non solum ergo nihil perdis, cum ignoscis; sed abundantius irrigaris. Caritas non angustatur. Ponis ibi lapidem offensionis, et tu tibi facis angustias. Vindicabo me, ulciscar me, ego illi ostendam, ego faciam: aestuas, laboras, cui licet ignoscendo esse securum, securum vivere, securum orare.