1 Timothy 2:1-4
“I exhort therefore that, first of all, supplications, prayers, intercessions, and giving of thanks be made for all men; for kings, and for all that are in authority; that we may lead a quiet and peaceable life in all godliness and honesty. For this is good and acceptable in the sight of God our Saviour; who will have all men to be saved, and to come unto the knowledge of the truth.” [R.V.: who wills that all men should be saved, etc.]
The Priest is the common father, as it were, of all the world; it is proper therefore that he should care for all, even as God, Whom he serves. For this reason he says, “I exhort therefore that, first of all, supplications, prayers, intercessions, and giving of thanks be made for all men.” From this, two advantages result. First, hatred towards those who are without is done away; for no one can feel hatred towards those for whom he prays: and they again are made better by the prayers that are offered for them, and by losing their ferocious disposition towards us. For nothing is so apt to draw men under teaching, as to love, and be loved. Think what it was for those who persecuted, scourged, banished, and slaughtered the Christians, to hear that those whom they treated so barbarously offered fervent prayers to God for them. Observe how he wishes a Christian to be superior to all ill-treatment. As a father who was struck on the face by a little child which he was carrying, would not lose anything of his affection for it; so we ought not to abate in our good will towards those who are without, even when we are stricken by them. What is “first of all”? It means in the daily Service; and the initiated know how this is done every day both in the evening and the morning, how we offer prayers for the whole world, for kings and all that are in authority. But some one perhaps will say, he meant not for all men, but for all the faithful. How then does he speak of kings? For kings were not then worshipers of God, for there was a long succession of ungodly princes. And that he might not seem to flatter them, he says first, “for all men,” then “for kings”; for if he had only mentioned kings, that might have been suspected. And then since the soul of some Christians might be slow at hearing this, and reject the exhortation, if at the celebration of the holy Mysteries it was necessary to offer prayers for a heathen king, he shows them the advantage of it, thus at least to reconcile them to the advice, “that we may lead a quiet and peaceable life”; as much as to say, Their safety is a security to us; as also in his Epistle to the Romans, he exhorts them to obey their rulers, “not for wrath but for conscience' sake.” For God has appointed government for the public good. When therefore they make war for this end, and stand on guard for our security, were it not unreasonable that we should not offer prayers for their safety in wars and dangers? It is not therefore flattery, but agreeable to the rules of justice. For if they were not preserved, and prospered in their wars, our affairs must necessarily be involved in confusion and trouble; and if they were cut off, we must either serve ourselves, or be scattered up and down as fugitives. For they are a sort of bulwarks thrown up before us, within which those who are inclosed are in peace and safety.
He says, “supplications, prayers, intercessions, and giving of thanks.” For we must give thanks to God for the good that befalls others, as that He makes the sun to shine upon the evil and the good, and sends His rain both upon the just and the unjust. Observe how he would unite and bind us together, not only by prayer but by thanksgiving. For he who is urged to thank God for his neighbor's good, is also bound to love him, and be kindly disposed towards him. And if we must give thanks for our neighbor's good, much more for what happens to ourselves, and for what is unknown, and even for things against our will, and such as appear grievous to us, since God dispenses all things for our good.
Moral. Let every prayer of ours, then, be accompanied with thanksgiving. And if we are commanded to pray for our neighbors, not only for the faithful, but for the unbelieving also, consider how wrong it is to pray against your brethren. What? Has He commanded you to pray for your enemies, and do you pray against your brother? But your prayer is not against him, but against yourself. For you provoke God by uttering those impious words, “Show him the same!” “So do to him!” “Smite him!” “Recompense him!” Far be such words from the disciple of Christ, who should be meek and mild. From the mouth that has been vouchsafed such holy Mysteries, let nothing bitter proceed. Let not the tongue that has touched the Lord's Body utter anything offensive, let it be kept pure, let not curses be borne upon it. For if “revilers shall not inherit the kingdom of God”, much less those who curse. For he that curses must be injurious; and injuriousness and prayer are at variance with each other, cursing and praying are far apart, accusation and prayer are wide asunder. Do you propitiate God with prayer, and then utter imprecations? If you forgive not, you will not be forgiven. But instead of forgiving, you beseech God not to forgive; what excessive wickedness in this! If the unforgiving is not forgiven, he that prays his Lord not to forgive, how shall he be forgiven? The harm is to yourself, not him. For though your prayers were on the point of being heard for yourself, they would never be accepted in such a case, as offered with a polluted mouth. For surely the mouth that curses is polluted with all that is offensive and unclean.
Source: Homilies on First Timothy (New Advent)