But you, oh LORD, are a shield for me, My glory and the one who lifts my head
David is sure of 3 things here: 1.) when no one would help him God was his shield 2.) when he had nothing to treasure God was his glory 3.) when he had no one to encourage him God did and lifted his head.
what a reassurance we can still be sure of the same things today
* notes from nelson's NKJV study bible