Charles H. Spurgeon on Psalms 79:6

"Pour out thy wrath upon the heathen that have not known thee." If thou must smite look further afield; spare thy children and strike thy foes. There are lands where thou art in no measure acknowledged; be pleased to visit these first with thy judgments, and let thine erring Israel have a respite. "And upon the kingdoms that have not called upon thy name." Hear us the prayerful, and avenge thyself upon the prayerless. Sometimes providence appears to deal much more severely with the righteous than with the wicked, and this verse is a bold appeal founded upon such an appearance. It in effect says —Lord, if thou must empty out the vials of thy wrath, begin with those who have no measure of regard for thee, but are openly up in arms against thee; and be pleased to spare thy people, who are thine notwithstanding all their sins.