Bede

When your enemy falls, do not rejoice, etc. Earlier he forbade laying snares for the righteous; now, to perfect himself in all things, he also forbids insulting enemies when they sin or incur some adversity, lest perchance, if by the mercy of the Lord they return to repentance and the salvation of their souls and begin to have faithful friendship with you, you would then blush because you once despised those whom divine grace had reserved for life. …

Commentary on Proverbs ↗