Matthew 5:9

When you have made your inward parts clean from every spot of sin, that dissentions and contentions may not proceed from your temper, begin peace within yourself, that so you may extend it to others.

Peace is the fixedness of order; by order, I mean an arrangement of things like and unlike giving to each its own place. And as there is no man who would not willingly have joy, so is there no man who would not have peace; since even those who go to war desire nothing more than by war to come to a glorious peace.

pacifici] are pronounced blessed, they namely who make peace first within their own hearts, then between brethren at variance. For what avails it to make peace between others, while in your own heart are wars of rebellious vices.

The peacemakers within themselves are they who having stilled all disturbances of their spirits, having subjected them to reason, have overcome their carnal desires, and become the kingdom of God. There all things are so disposed, that that which is most chief and excellent in man, governs those parts which we have in common with the brutes, though they struggle against it; nay even that in man which is excellent is subjected to a yet greater, namely, the very Truth, the Son of God. For it would not be able to govern what is inferior to it, if it were not subject to what is above it. And this is the peace which is given on earth to men of good will.

No man can attain in this life that there be not in his members a law resisting the law of his mind. But the peacemakers attain thus far by overcoming the lusts of the flesh, that in time they come to a most perfect peace.

The peacemakers with others are not only those who reconcile enemies, but those who unmindful of wrongs cultivate peace. That peace only is blessed which is lodged in the heart, and does not consist only in words. And they who love peace, they are the sons of peace.

The blessedness of the peacemakers is the reward of adoption, "they shall be called the sons of God." For God is our common parent, and no other way can we pass into His family than by living in brotherly love together.

Or, if the peacemakers are they who do not contend one with another, but reconcile those that are at strife, they are rightly called the sons of God, seeing this was the chief employment of the Only-begotten Son, to reconcile things separated, to give peace to things at war.

Or, because peace is then perfect when there is no where any opposition, the peacemakers are called the sons of God, because nothing resists God, and the children ought to bear the likeness of their Father.

ap. Anselm: The peacemakers have thus the place of highest honour, inasmuch as he who is called the king's son, is the highest in the king's house. This beatitude is placed the seventh in order, because in the sabbath shall be given the repose of true peace, the six ages being passed away.

But the husbandry is twofold, the one unwritten, and the other written. And in whatever way the Lord’s labourer sow the good wheat, and grow and reap the ears, he shall appear a truly divine husbandman. “Labour,” says the Lord, “not for the meat which perisheth, but for that which endureth to everlasting life.” And nutriment is received both by bread and by words. And truly “blessed are the peace-makers,” who instructing those who are at war in their life and errors here, lead them back to the peace which is in the Word, and nourish for the life which is according to God, by the distribution of the bread, those “that hunger after righteousness.” For each soul has its own proper nutriment; some growing by knowledge and science, and others feeding on the Hellenic philosophy, the whole of which, like nuts, is not eatable. …

XXIV. You may even go against wealth. Say, “Certainly Christ does not debar me from property. The Lord does not envy.” But do you see yourself overcome and overthrown by it? Leave it, throw it away, hate, renounce, flee. “Even if thy right eye offend thee,” quickly “cut it out.” Better is the kingdom of God to a man with one eye, than the fire to one who is unmutilated. Whether hand, or foot, or soul, hate it. For if it is destroyed here for Christ’s sake, it will be restored to life yonder.

After these principal material causes of impatience, registered to the best of our ability, why should we wander out of our way among the rest, what are found at home, what abroad? Wide and diffusive is the Evil One’s operation, hurling manifold irritations of our spirit, and sometimes trifling ones, sometimes very great. But the trifling ones you may contemn from their very littleness; to the very great ones you may yield in regard of their overpoweringness. Where the injury is less, there is no necessity for impatience; but where the injury is greater, there more necessary is the remedy for the injury, patience. Let us strive, therefore, to endure the inflictions of the Evil One, that the counter-zeal of our equanimity may mock the zeal of the foe. …

“But,” say they, “God is ‘good,’ and ‘most good,’ and ‘pitiful-hearted,’ and ‘a pitier,’ and ‘abundant in pitiful-heartedness,’ which He holds ‘dearer than all sacrifice,’ ‘not thinking the sinner’s death of so much worth as his repentance’, ‘a Saviour of all men, most of all of believers.’ And so it will be becoming for ‘the sons of God’ too to be ‘pitiful-hearted’ and ‘peacemakers;’ ‘giving in their turn just as Christ withal hath given to us;’ ‘not judging, that we be not judged.’ For ‘to his own lord a man standeth or falleth; who art thou, to judge another’s servant?’ ‘Remit, and remission shall be made to thee.’” Such and so great futilities of theirs wherewith they flatter God and pander to themselves, effeminating rather than invigorating discipline, with how cogent and contrary (arguments) are we for our part able to rebut, (arguments) which set before us warningly the “severity …

Of how deep guilt, then, adultery, which is likewise a matter of fornication, in accordance with its criminal function, is to be accounted, the Law of God first comes to hand to show us; if it is true, (as it is), that after interdicting the superstitious service of alien gods, and the making of idols themselves, after commending (to religious observance) the veneration of the Sabbath, after commanding a religious regard toward parents second (only to that) toward God, (that Law) laid, as the next substratum in strengthening and fortifying such counts, no other precept than “Thou shalt not commit adultery.” For after spiritual chastity and sanctity followed corporeal integrity. And this (the Law) accordingly fortified, by immediately prohibiting its foe, adultery. …

24. The Holy Spirit warns us, and says, “What man is he that desireth to live, and would fain see good days? Refrain thy tongue from evil, and thy lips that they speak no guile. Eschew evil, and do good; seek peace, and ensue it.” The son of peace ought to seek peace and ensue it. He who knows and loves the bond of charity, ought to refrain his tongue from the evil of dissension. Among His divine commands and salutary teachings, the Lord, when He was now very near to His passion, added this one, saying, “Peace I leave with you, my peace I give unto you.” He gave this to us as an heritage; He promised all the gifts and rewards of which He spoke through the preservation of peace. If we are fellow-heirs with Christ, let us abide in the peace of Christ; if we are sons of God, we ought to be peacemakers. …

In Malachi: “Hath not one God created us? Is there not one Father of us all? Why have ye certainly deserted every one his brother?” Of this same thing according to John: “Peace I leave with you, my peace I give unto you.” Also in the same place: “This is my commandment, That ye love one another, even as I have loved you. Greater love than this has no man, than that one should lay down his life for his friends.” Also in the same place: “Blessed are the peacemakers, for they shall be called the sons of God.” Also in the same place: “Verily I say unto you, That if two of you shall agree on earth concerning everything, whatever you shall ask it shall be given you from my Father which is in heaven. …

Let no one suppose that all the remaining company of those who have believed are condemned, thinking that we who are virgins alone shall be led on to attain the promises, not understanding that there shall be tribes and families and orders, according to the analogy of the faith of each. And this Paul, too, sets forth, saying, “There is one glory of the sun, and another glory of the moon, and another glory of the stars: for one star differeth from another star in glory. So also is the resurrection of the dead.” And the Lord does not profess to give the same honours to all; but to some He promises that they shall be numbered in the kingdom of heaven, to others the inheritance of the earth, and to others to see the Father. …

XLVI. Let not the heathen therefore know of your differences among one another, nor do you receive unbelievers as witnesses against yourselves, nor be judged by them, nor owe them anything on account of tribute or fear; but “render to Cæsar the things that are Cæsar’s, and unto God the things that are God’s,” as tribute, taxes, or poll-money, as our Lord by giving a piece of money was freed from disturbance. Choose therefore rather to suffer harm, and to endeavour after those things that make for peace, not only among the brethren, but also among the unbelievers. For by suffering loss in the affairs of this life, thou wilt be sure not to suffer in the concerns of piety, and wilt live religiously, and according to the command of Christ. …

“ Blessed are the peacemakers .…” To the man who is a peacemaker in either sense there is in the Divine oracles nothing crooked or perverse, for they are all plain to those who understand. And because to such an one there is nothing crooked or perverse, he sees therefore abundance of peace in all the Scriptures, even in those which seem to be at conflict, and in contradiction with one another. And likewise he becomes a third peacemaker as he demonstrates that that which appears to others to be a conflict in the Scriptures is no conflict, and exhibits their concord and peace, whether of the Old Scriptures with the New, or of the Law with the Prophets, or of the Gospels with the Apostolic Scriptures, or of the Apostolic Scriptures with each other. …

1. O Lord , since eternity is Thine, art Thou ignorant of the things which I say unto Thee? Or seest Thou at the time that which cometh to pass in time? Why, therefore, do I place before Thee so many relations of things? Not surely that Thou mightest know them through me, but that I may awaken my own love and that of my readers towards Thee, that we may all say, “Great is the Lord, and greatly to be praised.” I have already said, and shall say, for the love of Thy love do I this. …

2. I have said these things by way of preface, lest any one should think, because you are not of our communion, that I have been influenced by forwardness rather than consideration in sending this letter, and in desiring thus to confer with you regarding the welfare of the soul; though I believe that, if I were writing to you about an affair of property, or the settlement of some dispute about money, no one would find fault with me. So precious is this world in the esteem of men, and so small is the value which they set upon themselves! This letter, therefore, shall be a witness in my vindication at the bar of God, who knows the spirit in which I write, and who has said: “Blessed are the peacemakers: for they shall be called the sons of God.”