1 Timothy 2:1

Let us then exhort the saints to give thanks for us; and let us do the same ourselves for one another. To priests especially this good work belongs, since it is an exceeding privilege. For drawing near, we first give thanks for the whole world and the good things common [to all]. For even though the blessings of God be common, yet doth the common preservation include thine own; so that thou both owest common thanksgivings for thine own peculiar blessing, and for the common blessings shouldest of right render up thine own peculiar praise: for He lighted up the sun not for thee alone, but also for all in common; but nevertheless thou for thy part hast it whole.… So then let us give thanks also for the confidence of others [toward God]. For this custom is an ancient one, planted in the Church from the beginning. Thus Paul also giveth thanks for the Romans, for the Corinthians, for the whole world.

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.