Charles H. Spurgeon on Psalms 109:15

Again, he wishes that his father's sins may follow up the transgressor and assist to fill the measure of his own iniquities, so that for the whole accumulated load the family may be smitten with utter extinction. A king might justly wish for such an end to fall upon an incorrigible brood of rebels; and of persecutors, continuing in the same mind, the saints might well pray for their extinction; but the passage is dark; and we must leave it so. It must be right or it would not be here, but how we cannot see. Why should we expect to understand all things? Perhaps it is more for our benefit to exercise humility, and reverently worship God over a hard text, than it would be to comprehend all mysteries.