But thou, O Lord, art a shield for me; or, about me(see the Revised Version). (For the sentiment, comp. Genesis 15:1; Deuteronomy 33:29; 2 Samuel 22:3; Psalms 28:7; Psalms 33:20; Psalms 84:9, etc.) The expression has peculiar force in David's mouth, who, as a "man of war," fully appreciated the saving power of a shield.
My glory (comp. Psalms 62:7). And the lifter up of mine head. As God had raised up David to the throne (2 Samuel 2:4; 2 Samuel 5:3), and prospered him in his wars (2 Samuel 8:1-14), and exalted him above all the other kings of the period, so he was well able now, if he so willed, to restore him to his place and re-establish him in the monarchy.