10 Each one too of us may say, when a multitude of vices and lusts leads the resisting mind in the law of sin, “O Lord, how are they multiplied that trouble me! Many rise up against me.” And, since despair of recovery generally creeps in through the accumulation of vices, as though these same vices were mocking the soul, or even as though the Devil and his angels through their poisonous suggestions were at work to make us despair, it is said with great truth, “Many say unto my soul, There is no salvation for him in his God.
But You, O Lord, art my taker.” For this is our hope, that He has vouchsafed to take the nature of man in Christ. “My glory;” according to that rule, that no one should ascribe ought to himself. “And the lifter up of my head;” either of Him, who is the Head of us all, or of the spirit of each several one of us, which is the head of the soul and body. For “the head of the woman is the man, and the head of the man is Christ.” But the mind is lifted up, when it can be said already, “With the mind I serve the law of God;” that the rest of man may be reduced to peaceable submission, when in the resurrection of the flesh “death is swallowed up in victory.” “With my voice I have cried unto the Lord;” with that most inward and intensive voice.
“And He heard me out of His holy mountain;” Him, through whom He has succoured us, through whose mediation He hears us. “I slept, and took rest; and rose, for the Lord will take me up.” Who of the faithful is not able to say this, when he calls to mind the death of his sins, and the gift of regeneration? “I will not fear the thousands of people that surround me.” Besides those which the Church universally has borne and bears, each one also has temptations, by which, when compassed about, he may speak these words, “Arise, O Lord; save me, O my God:” that is, make me to arise.
“Since You have smitten all who oppose me without a cause:” it is well in God's determinate purpose said of the Devil and his angels; who rage not only against the whole body of Christ, but also against each one in particular. “You have broken the teeth of the sinners.” Each man has those that revile him, he has too the prime authors of vice, who strive to cut him off from the body of Christ. But “salvation is of the Lord.” Pride is to be guarded against, and we must say, “My soul cleaved after You.” “And upon Your people” be “Your blessing:” that is, upon each one of us.
Source: The Enarrations, or Expositions, on the Psalms (New Advent)