1 Samuel 14:52

There was indeed a mighty war against the Philistines, etc. The primary cause of the mighty war against the Philistines was this, because Saul was gathering all the strong and fit men for battle to himself. For if the king himself were not encircled by the hand of a stronger military, by no means would he be terrifying to the neighboring enemies, nor would he powerfully incite them to war; but as in the former times Israel had served them most disgracefully without any hope of freedom; thus surely, thus in the Church, all who are dissolved from good works, nor are endowed with the army of spiritual virtues; because being idle and neglectful we sin, we pay the enemy's tributes of evil conversation with weak languor from the hostile ones. But when we recover from servitude to sin, we resume the hope of victory, the enemy rises, and attacks us with more frequent and sharper stings of temptations, so that if possible, he may recall us to the servitude of crimes; or, if not possible, at least avenge by fiercely raging the injury of his own contempt. But let us pass from our morals to view the allegorical deeds of the ancients; and in the very beginning of the nascent Church, the more the stronger and more fit men for spiritual battle Christ was gathering to himself, the more spoils of souls at that time and they were frequently taking from unclean spirits; but also they were enduring greater struggles of martyrdom from the same.

Such men, because they profitably stand over the chosen faithful, because they mightily advance their subjects to victories of virtues, it follows: "And there was fierce war against the Philistines all the days of Saul." The war of those teachers is weak and altogether feeble who have neither the light of divine knowledge nor the strength of good work. Therefore war is called powerful when harsh sons rule over the chosen peoples, because he is able to speak good things profitably to others who has been accustomed to precede his words with great deeds. But we must also subtly consider what is said in a more complex way: 'All the days of Saul'. What are the days of Saul, if not works of light? What is the war of a teacher other than what is waged by the tongue? Therefore he fights all his days who teaches others many things, yet puts forth nothing in his teaching except what first shines forth in his own work. For he fights in his own day who draws the words of preaching from the light of his own virtue. He therefore wishes to fight in another's day who strives to oppose wicked spirits not by speaking what he does, but by preaching what he knows. But he fights all his days, because he displays all the commandments of God in the light of his work, which he then wishes to set forth through the care of preaching. Rightly therefore is the war called powerful in which one fights with every kind of light of virtues and works. It can also be that by the statement that he fights all his days, the urgency of spiritual combat is signified. For he who leads a life full of virtues lives in days. Therefore the powerful war of the chosen teacher is recognized in all his days, because he is always seen to overcome evil spirits who is never separated from the light of virtues. But chosen men have the virtue of fighting and also the humility of fear. Through virtue they triumph, but through fear they do not cease to gather reinforcements. Hence they fight all the more bravely, the more they do not stop gathering forces for the conflict. Rightly therefore the cause of the powerful war is added: 'For whomever Saul saw to be a strong man and fit for battle, he joined him to himself.' As if to say: He was able to wage war powerfully for this reason, because he did not cease to gather an army. But since he is said to have allied to himself not only strong men but also those fit…