John Calvin Commentary Psalms 74:18

"Remember this, that the enemy hath reproached, O Jehovah, And that a foolish people hath blasphemed thy name." — Psalms 74:18 (ASV)

Remember this. After encouraging the hearts of the godly by magnifying the divine power and goodness, the prophet now returns to the continuation of his prayer. He first complains that the enemies of his people revile God and yet continue unpunished.

When he says, Remember this, the manner of expression is emphatic, and the occasion demanded it, for it is not a crime of small magnitude to treat the sacred name of God with contempt. For the sake of contrast, he states that it was a worthless or foolish people who thus insolently presumed to pour out their reproaches against God.

The Hebrew word נבל, nabal, denotes not only a foolish man, but also a wicked and infamous person. The prophet, therefore, justly describes the despisers of God as people who are vile and worthless.