Proverbs 4:16

Except they have done mischief - The night is their time for spoil and depredation. And they must gain some booty, before they go to rest. This I believe to be the meaning of the passage. I grant, also, that there may be some of so malevolent a disposition that they cannot be easy unless they can injure others, and are put to excessive pain when they perceive any man in prosperity, or receiving a kindness. The address in Virgil, to an illnatured shepherd is well known: -

Et cum vidisti puero donata, dolebas:

Et si non aliqua nocuisses, mortuus esses