John Gill Commentary Proverbs 24:18

"Lest Jehovah see it, and it displease him, And he turn away his wrath from him." — Proverbs 24:18 (ASV)

Lest the Lord see [it], and it displease him
Who sees all things, not only external actions, but the heart, and the inward motions of it; and though men may hide the pleasure they feel at the misery of an enemy from others, they cannot hide it from the Lord; nor is this said by way of doubt, but as a certain thing; and which the Lord not barely sees, but takes notice of, and to such a degree as to resent it, and show his displeasure at it by taking the following step;

and he turn away his wrath from him ;
remove the effects of it, raise him out of his fallen and distressed condition, and restore him to his former prosperous one; and not only so, but turn it upon you, as Gersom supplies the words, and not amiss;

so that there is a strange and sudden change of circumstances; you that were pleasing yourself with the distress of your enemy are fallen into the same, and he is delivered out of it; which must be a double affliction to such a man; so that by rejoicing at an enemy, he is doing his enemy good and himself hurt; see (Proverbs 17:5) .