To Asella
1. Were I to think myself able to requite your kindness I should be foolish. God is able in my stead to reward a soul which is consecrated to Him. So unworthy, indeed, am I of your regard that I have never ventured to estimate its value or even to wish that it might be given me for Christ's sake. Some consider me a wicked man, laden with iniquity; and such language is more than justified by my actual sins. Yet in dealing with the bad you do well to account them good. It is dangerous to judge another man's servant; and to speak evil of the righteous is a sin not easily pardoned. The day will surely come when you and I shall mourn for others; for not a few will be in the flames.
Source: Letters (New Advent)