1 Samuel 18:10

It was also through a wicked angel that the transgressor was tempted in the account of the book of Kings [Samuel], where it says "The evil spirit from God came upon Saul." Just men, too, like Job and the apostle Paul and others of that kind were tried by the devil. It is clear that all created things are subject to the discretion or command of the Creator.

After the next day, an evil spirit from God invaded Saul, etc. As the light of the faithful gradually increased, so did the insanity and blindness of the perfidious Jews, who, aroused by an unclean spirit in the midst of their Synagogue against the Lord, would sing the words of prophecy with a frenzied mouth, which they did not understand. But the Lord, to calm and mitigate their malice, daily reiterated through the apostles the example of His patience and suffering. For He sang to them with His own hand, when through His excellent worker of the body He said: Therefore let all the house of Israel know most certainly that God has made this Jesus, whom you crucified, both Lord and Christ (Acts II).

Saul was holding a spear, etc. The people of the Jews held the power of the kingdom and exercised it against the Lord Savior; thinking that they could extinguish His faith and glory by persecuting Him, in the manner of other mortals whose praise and memory, love or hatred, often fades with their life itself. Against these He prays to the Father in the Psalms: "Do not let me become like those who go down to the pit" (Psalm 142). For as much as David, a living stone, feels and discerns, exceeds a wall, which lacks nature, life, sense, and reason; so much the Mediator between God and men, the man Christ Jesus, differs from pure men, even if they are most holy. He indeed, in suitable places, is symbolized by the term stone, not just any stone in the wall, according to those to whom it is said: "You also, like living stones, are being built" (1 Peter 2). But as the chief, cornerstone, chosen, precious stone, founded in the foundation, which, bearing and protecting the whole building of the rising Church, unites circumcision and uncircumcision in unanimous peace. For it can also be understood, not inappropriately, that Saul thought he could pin David to the wall; that the Jews thought they could eradicate the name and memory of Christ and remove Him from the land of the living if they could kill or banish the apostles, the preachers of His resurrection, those who are the nearest part of His house, that is, the Church. But David could not be pinned to the wall, Christ's glory could not be diminished, nor could the impious, however much they strove, be made like those who go down to the pit; that is, buried in the tomb, neither to be resurrected before the day of judgment.