But thou, O Lord, [art] a shield for me,.... Or "about me" protecting and defending me. David was a military man, and often alludes to military affairs; and borrows words from thence, expressive of his great security from the Lord; see Ps 18:2.
So Jehovah the Father was a shield to Christ, in his infancy, from Herod's rage and fury; and afterwards from the insults of the Pharisees, and their attempts to take away his life before the time; and in his sufferings and death, so as that his faith and confidence in him were kept up, and he got the victory over sin, Satan, and the world; see Ps 22:9.
And the Lord is a shield unto all his people, Ge 15:1. They are kept by his power, and encompassed about with his favour, as with a shield; his veracity and his faithfulness in his promises, and his truth, are their shield and buckler: and especially his Son, the Lord Jesus Christ, is the shield which faith makes use of, particularly his blood and righteousness, and salvation by him; which it holds up, and defends itself with, against the charges of the law, the accusations of conscience, and the temptations of Satan; and which are a security from the justice of God, and wrath to come;my glory; who took David from the sheepfold, and made him king over Israel, and raised him to all the glory he had enjoyed; and in whom he gloried as his covenant God, and of whom he made his boast; and not of his strength, valour, wisdom, riches, and honour.
So God the Father is the glory of Christ, the glorifier of him, by supporting him under his sufferings, raising him from the dead, and setting him at his own right hand, where he is crowned with glory and honour: he is the glory of his people, in whom they glory, and by whom they are called to eternal glory; and who will give it to them, and reveal it in them, even an eternal weight of it, which the sufferings of this life are not worthy to be compared unto;and the lifter up mine head; such as the helmet is: the Lord was lifter up of David's head when he brought him to the throne, and afterwards gave him victory over his enemies; for so the phrase of lifting up the head signifies; see 2Ki 25:27.
And he was the lifter up of Christ's head when he raised him from the dead; and exalted him, both with and at his right hand, to be a Prince and a Saviour, and gave him a name above every name. And he is the lifter up of the heads of his people in conversion, when he raises them from a low estate, and sets them among princes to inherit the throne of glory; and when he gives them comfort, peace, and joy, which causes them to lift up their heads; whereas in sorrow, and mourning, and distress, the head is bowed down like a bulrush, Isa 58:5; and when he gives them boldness and confidence, as at the throne of grace now, through the sprinkling of the blood of Christ upon them; so at the bar of judgment hereafter, through the righteousness of Christ put upon them, as that they shall not be ashamed nor confounded; see Lu 21:28; and he will be the lifter up of their heads in the resurrection morn, and when they shall appear with Christ in glory.