Psalms 41:2

He comments on God's favors to him in different ways: he will give freedom from perils, he says, will closely guard him so that he will suffer nothing, provide him with life and make him appear as blessed by the vast number of favors in the sight of everyone.

"And deliver him not into the hand of his enemy." The enemy is the devil. Let none think of a man his enemy, when he hears these words. Haply one thought of his neighbour, of him who had a suit with him in court, of him who would take from him his own possession, of him who would force him to sell to him his house. Think not this; but that enemy think of, of whom said the Lord, "an enemy hath done this." For He it is who suggests that for things earthly he be worshipped, for overthrow the Christian Name this enemy cannot. For he hath seen himself conquered by the fame and praises of Christ, he hath seen, whereas he slew Christ's Martyrs, that they are crowned, he triumphed over. He hath begun to be unable to persuade men that Christ is nought; and because by reviling Christ, he now with difficulty deceives, by lauding Christ, he endeavours to deceive. Before this what said he? Whom worship ye? A Jew, dead, crucified, a man of no moment, who could not even from himself drive away death. When after His Name he saw running the whole human race, saw that in the Name of the Crucified temples are thrown down, idols are broken, sacrifices abolished; and that all these things predicted in the Prophets are considered by men, by men with wonder astonished, and closing now their hearts against the reviling of Christ; he clothes himself with praise of Christ, and begins to deter from the faith in another manner. Great is the law of Christ, powerful is that law, divine, ineffable! but who fulfilleth it? In the name of our Saviour, "tread upon the lion and the dragon." By reviling openly roared the lion; by lauding craftily lurks the dragon. Let them come to the faith, who doubted; and not say, Who fulfilleth it? If on their own strength they presume, they will not fulfil it. Presuming on the grace of God let them believe, presuming (on it) let them come; to be aided come, not to be judged. So live all the faithful in the Name of Christ, each one in his degree fulfilling the commands of Christ, whether married, or celibates and virgins, they live as much as God granteth them to live; neither presume they in their own strength, but know that in Him they ought to glory...