“Rejoice not when thine enemy falleth, and let not thine heart be glad when he stumbleth: Lest the LORD see it, and it displease him, and he turn away his wrath from him,” (Proverbs 24:17-18).
Here, the implication is that the Lord’s displeasure shall turn upon those who glory and revel in the sufferings of their enemies.
And this also, seem relevant:
“Fret not thyself because of evil men, neither be thou envious at the wicked,” (Proverbs 24:19).
Nothing that evil men do, no matter how grievous or disturbing to our souls or contrary to our nature is to shift us from our sure foundation and confidence in Christ–or compromise our daily peace–for our trust is in the providence of God.
Moreover, while the wicked may possess much and enjoy great favor for a season, they will be dispossessed of all they have (Psalm 17:14; Matthew 6:2; Revelation 21:8).
Yet, we have a greater reward, the unspeakable gift of God! (2 Corinthians 9:15).