Ambrose of Milan : David never waged war unless he was driven to it. Thus prudence was combined in him with fortitude in the battle. For even when about to fight single-handed against Goliath, the enormous giant, he rejected the armor with which he was laden. His strength depended more on his own arm than on the weapons of others. Then, at a distance, to get a stronger throw, with one cast of a stone, he killed his enemy. — On the Duties of the Clergy 1.35.177 Bede : And he put his hand into his bag, etc. We said above that the pastoral bag represents the hearts of the shepherds, who cling intimately to the side of Christ. Why then should not more rightly the conscience or soul of the highest and singularly good shepherd be called the pastoral bag? It contains five most clear stones, strong enough to overthrow the enemy: for it holds the purest knowledge of divine law, by which all error is conquered: whose fullness is expressed in one stone, and its breadth is spread in five books, which Christ alone could perfectly know and fulfill. Putting his hand into this bag, he took one of the five stones he had placed there, arming himself with one of the five books of Moses, of which he was the author and fulfiller, that is Deuteronomy, he used it as testimony to repel the ancient enemy's temptations. Moreover, he taught us, instructed by the Holy Scriptures, to overcome the snares of the same enemy through the unity of faith and charity. And he skillfully threw with the sling; for by the spiritual sense of the Scriptures, which we showed above as triple, he broke the pride of the enemy and gave us spiritual understanding as weapons against him. And he skillfully struck the Philistine on the forehead, because the very audacity of his presumption felled the devil: from the very show of his profession, he proved the worshippers of perverse doctrines to be foolish. For just as the hand indicates the strength of operations, so the forehead indicates the recognition of profession. Therefore, whoever fears being struck on the forehead, let him arm his forehead with the sign of the life-giving cross, saying with the Apostle: But far be it from me to boast except in the cross of our Lord Jesus Christ (Galatians VI). Finally, David himself, because he knew how to say: The light of your countenance is signed upon us, O Lord (Psalm IV), indeed struck down the forehead of the loquacious boasting Philistine, not sealed with the light of heavenly grace, although covered with the helmet of boasting. And rightly the stone is said to be fixed in his forehead, because the devil will never completely shake off the sentence of the divine word, which he receives either in himself or in his followers from Christ the Saviour or His members, but cursed he will suffer eternal damnation in hell without end. Similar to what Isaiah testifies to his irrevocable damnation, saying: And the passage of the rod is founded, which the Lord God will rest upon him (Isaiah XXX), that is, he will never be saved from torments in eternity, nor will he roam between punishments over varying times, nor will he find rest after the manner of our blows, who frequently raise the rod or lash from the back of the one being flogged, so that we can strike again, but without any interval of rest, he will groan subjected to perpetual retribution. This is against those who, because of Isaiah's testimony, where it is written about the impious, say: And they will be imprisoned together in the dungeon, and after many days they will be visited (Isaiah XXIV); promise the devil and his angels and all the reprobate remission of such great crimes and eternal life with the Lord after long and innumerable ages, against the judgment of the Lord himself, who foretold that he will say in the last judgment: Depart from me, you cursed, into eternal fire (Matthew XXV). But the giant, struck by the stone, fell to the ground; because the diabolic error, struck by the word of God, no longer lofty as it once boasted, was revealed to be not heavenly but earthly and even lowest. — Commentary on Samuel John Chrysostom : Therefore, let us take in our hands that stone, I mean the cornerstone, the spiritual rock. If Paul could think in these terms of the rock in the desert, no one will in any way feel resentment against me if I understand David's stone in the same sense. In the case of the Jews in the desert, it was not the nature of the visible stone but the power of the spiritual stone which sent forth those streams of water. So, too, in David's case, it was not the visible stone but the spiritual stone which sank into the barbarian's head. This is why, at that time, I promised that I would say nothing based on rational arguments. "Our weapons are not merely carnal but spiritual, demolishing sophistries and reasoning and every proud height that raises itself against the knowledge of God." — AGAINST THE ANOMOEANS 11.6 Maximus of Turin : Therefore, brothers, let us arm ourselves with heavenly weapons for the coming judgment of the world: let us gird on the breastplate of faith, protect ourselves with the helmet of salvation, and defend ourselves with the word of God as with a spiritual sword. For the one who is arrayed with these weapons does not fear present disturbance and is not afraid of future judgment, since holy David, protected with this devotion, killed the very strong and armed Goliath without weapons and struck down the warlike man, girt about with defenses on all sides, by the strength of his faith alone. For although holy David did not put on a helmet, strap on a shield, or use a lance, he killed Goliath. He killed him, however, not with an iron spear but with a spiritual sword, for although he appeared weaponless in the eyes of human beings, yet he was adequately armed with divine grace. But the spiritual sword itself was not a sword, since it was not by the sword but by a stone that Goliath died when he was struck down. We read in the Scriptures that Christ is figuratively designated by the word stone, as the prophet says: "The stone that the builders rejected has become the head of the corner." Therefore, when Goliath is struck by a stone, he is struck down by the power of Christ. And in what part of the body is he struck? On the forehead, for when the sacrilegious man is struck, there Christ was absent, and where his end comes upon him, there the sign of salvation is not to be found. For although Goliath was protected by weapons on all sides, still his forehead was exposed to death because it did not carry the Savior's seal, and therefore he is slain in the spot where he is found to be bare of God's grace.But there is no one who does not realize that this took place figuratively. For David had also put on armor beforehand but, since he was so heavy and awkward in it that he could hardly walk, he removed it at once, signifying that the weapons of this world are vain and superfluous things and that the person who chooses to involve himself in them will have no unimpeded road to heaven, since he will be too heavy and encumbered to walk. At the same time this teaches us that victory is not to be hoped for from arms alone but is to be prayed for in the name of the Savior. — SERMON 85.3 Paulinus of Nola : Having trust in Christ, consigning everything to the God of powers, regarding God alone as all that is highest—this has always been efficacious in achieving every good. This is the faith that has prevailed over all weapons. This was the strength that made that slight boy great, for he grew stronger by spurning weapons and brought low the armed giant by the power of a stone. — POEMS 26.150