LORD, by thy favour thou hast made my mountain to stand strong: thou didst hide thy face, and I was troubled.
By thy favour ... - "by thy favour" (not because of my merits), answering to "in His favour is life" (Psalms 30:5) - literally, 'thou hast established strength for my mountain;' thou hast made my affairs and kingdom stand secure as a mountain: cf. for "mountain" as an image of unshaken firmness, Isaiah 2:2; Psalms 76:4, especially applicable to David's dominion, the central seat of which was on Mount Zion (cf. 2 Samuel 5:8-9; 2 Samuel 5:12; Nehemiah 3:25; Micah 4:8).
I was troubled - `confounded;' referring to the stupifying effect on David of the sudden stroke whereby God so thinned Israel's numbers, on which David had so prided himself.