1 Samuel 12:23

What did Samuel profit Saul? Did he not mourn for him even to his last day, and not merely pray for him only? What did he profit the Israelites? Did he not say, "God forbid that I should sin in ceasing to pray for you"? Did they not all perish? Do prayers then, you say, profit nothing? They profit even greatly: but it is when we also do something. For prayers indeed coöperate and assist, but a man coöperates with one that is operating, and assists one that is himself also working. But if thou remainest idle, thou wilt receive no great benefit.

Wherefore also to Peter Christ saith, "If thou lovest Me, feed My sheep." For he who loveth Christ loveth also His flock. And Moses too did He then set over the people of the Jews, when he had shown a kindly feeling towards them. And David in this way came to be king, having been first seen to be affectionately-minded towards them; so much indeed, though yet young, did he grieve for the people, as to risk his life for them, when he killed that barbarian.… And Samuel too was very affectionate; whence it was that he said, "But God forbid that I should sin in ceasing to pray unto the Lord for you." In like way Paul also, or rather not in like way, but even in a far greater degree, burned towards all his subjects.

The exercise of the gift of piety consists in the abundance of interior compassion. Of this it is said in Ecclesiasticus: "These are men of mercy, whose acts of piety have not failed." So it was with Samuel, when the people sought a king; afterwards …

What then is it that Moses and Samuel are preferred to the other fathers in petition, except that these two alone in the entire sequence of the Old Testament are read to have prayed even for their enemies? One is assailed with stones by the people, and yet he entreats the Lord for the one who stoned him; the other is cast down from leadership, and yet when asked to pray, he confesses saying: "Far be this sin from me against the Lord, that I should cease to pray for you."

Hence the Truth says: "When you stand to pray, forgive if you have anything in your hearts." We show the virtue of forgiveness more clearly if we bring forward one testimony from the Old Testament. Certainly when Judea had offended the justice of its Creator through its demanding sins, the Lord, forbidding His prophet from prayer, says: "Do not take up praise and prayer for them. If Moses and Samuel stood before me, my soul would not be toward this people." What is it that, with so many fathers passed over and left aside, Moses and Samuel alone are brought forward, whose wondrous power of obtaining is shown, while even they are said to be unable to intercede? As if the Lord were saying openly: I do not even hear those whom I by no means despise on account of the great merit of their petition. What then is it that Moses and Samuel are preferred to the other fathers in petition, except that these two alone in the entire sequence of the Old Testament are read to have prayed even for their enemies? One is assailed with stones by the people, and yet he entreats the Lord for the one who stoned him; the other is cast down from leadership, and yet when asked to pray, he confesses saying: "Far be this sin from me against the Lord, that I should cease to pray for you." "If Moses and Samuel stood before me, my soul would not be toward this people." As if He were saying openly: I do not even now hear those on behalf of friends, whom I know by the merit of their great virtue to pray even for enemies. Therefore the power of true prayer is the loftiness of charity. And then each person obtains what he rightly asks, when his mind in petition is not darkened by hatred of an enemy. But often we overcome a reluctant mind if we also pray for enemies. The mouth pours forth prayer for adversaries, but would that the heart hold love. […]