John Calvin Commentary Psalms 59:8

"But thou, O Jehovah, wilt laugh at them; Thou wilt have all the nations in derision." — Psalms 59:8 (ASV)

But thou, O Jehovah! shalt laugh at them. In the face of all this opposition, David's confidence only increases. When he says that God would laugh at his enemies, he employs a figure of speech well suited to enhance God's power, suggesting that when the wicked have perfected their schemes to the utmost, God can, without any effort and, so to speak, as if in sport, dissipate them all.

As soon as God overlooks their actions, their pride and insolence take the opportunity to emerge, for they forget that even when He seems to have paused His activity, He only needs to nod, and His judgments will be executed. David, accordingly, in his contempt for his adversaries, tells them that God had no need to make extensive preparations but, at the moment He saw fit to enact retribution, would, by a mere play of His power, annihilate them all. In this way, he conveys a severe rebuke to that blind infatuation which led them to boast so excessively of their own powers and to imagine that God was sleeping in the heavens.

At the end of the verse, mention is made of all nations, to suggest that even if they might equal the whole world in numbers, they would prove to be a mere mockery with all their influence and resources. Or the words may be read—even as thou hast all the nations in derision. It is obvious that David ridicules the vain boasting of his enemies, who thought no undertaking was too great to be accomplished by their numbers.