Charles Ellicott Commentary Psalms 66:7

"He ruleth by his might for ever; His eyes observe the nations: Let not the rebellious exalt themselves. Selah" — Psalms 66:7 (ASV)

His eyes behold. —Better, his eyes keep watch on the nations. God is, as it were, Israel’s outpost, ever on the alert to warn and defend them against surrounding nations.

Let not ... —Literally, the rebellious, let them not exalt for themselves, where we may supply “horn” as in Psalm 75:4-5, or “head” as in Psalm 3:3; Psalms 110:7. For the rebellious, compare Psalm 68:6.