8 You threw yourself down at my knees, you prostrated yourself, you begged me— I use your own words— to spare “your half-pint of blood.” Oh! Miserable wretch! You thought nothing of God's judgment, and feared no vengeance but mine. I forgave you, I admit; what else being a Christian could I do? I urged you to repent, to wear sackcloth, to roll in ashes, to seek seclusion, to live in a monastery, to implore God's mercy with constant tears. You however showed yourself a pillar of confidence, and excited as you were by the viper's sting you became to me a deceitful bow; you shot at me arrows of reviling.
I have become your enemy because I tell you the truth. I do not complain of your calumnies; everyone knows that you only praise men as infamous as yourself. What I lament is that you do not lament yourself, that you do not realize that you are dead, that, like a gladiator ready for Libitina, you deck yourself out for your own funeral. You wear not sackcloth but linen, you load your fingers with rings, you use toothpowder for your teeth, you arrange the stray hairs on your brown skull to the best advantage.
Your bull's neck bulges out with fat and droops no whit because it has given way to lust. Moreover you are redolent of perfume, you go from one bath to another, you wage war against the hair that grows in spite of you, you walk through the forum and the streets a spruce and smooth-faced rake. Your face has become the face of a harlot: you know not how to blush. Return, unhappy man, to the Lord, and He will return to you. Repent, and He will repent of the evil that He has purposed to bring upon you.
Source: Letters (New Advent)