Matthew 18:19

Concord occurs in two kinds: first, in agreement of thought, when two minds think the same ideas (as the apostle called it) and have the same thoughts. Second, in agreement of will, in living similar lives. But since "If two of you agree on earth about anything they ask, it will be done for them by Jesus' Father in heaven," if something is asked of the Father in heaven and is not granted, it is clear that the two here on earth are not in harmony. The reason why we do not achieve our desires and prayers is our own fault: we do not agree either in our thoughts or in our way of life. Besides, if we are the body of Christ and "God arranged the members in the body, each one of them … so that the members may have the care for one another, and if one member suffers all suffer together; if one member is honored all rejoice together," then we must practice the harmony that comes from God's music, so that when we are gathered in Christ's name, Christ may be in our midst, who is God's word and wisdom and power.

And this also is the reason why our prayers are not granted, because we do not agree together in all things upon earth, neither in doctrine, nor in conversation. For as in music, unless the voices are in time there is no pleasure to the hearer, so in the Church, unless they are united God is not pleased therein, nor does He hear their words.

Or, In whatever the two testaments are in agreement, for this every prayer is found acceptable to God.

How important a place the unanimity and harmony of brothers hold with God! We can know from this very fact that the Lord has clearly said that when two or three pray in unanimity, the Father grants everything from heaven. For with God nothing is more pleasing than brotherly peace, nothing better than unanimity and harmony, according to what is written: "Behold, how good and pleasant it is when brothers dwell in unity. And again: "There is great peace among those who love your name, and there is no stumbling block for them." And in another place: "The God who makes us live in harmony in the house." So Isaiah also testified: "Lord," he said, "our God, give us peace. For you have given us everything." That this harmony of brothers is pleasing to God, the Holy Spirit declared through Solomon, saying, "There are three things which are pleasing to God and men: harmony of brothers, love of one's neighbors and the union of man and woman." So quite rightly the Lord in this passage testifies that when two or three come together on earth, whatever they ask for, all is granted by the Father.

"And again I say unto you, that if two of you shall agree on earth as touching anything that they shall ask, it shall be done for them of my Father which is in Heaven. For where two or three are gathered together in my name, there am I in the midst of them."

Seest thou how by another motive also He puts down our enmities, and takes away our petty dissensions, and draws us one to another, and this not from the punishment only which hath been mentioned, but also from the good things which spring from charity? For having denounced those threats against contentiousness, He putteth here the great rewards of concord, if at least they who are of one accord do even prevail with the Father, as touching the things they ask, and have Christ in the midst of them.

"Are there then indeed nowhere two of one accord?" Nay, in many places, perchance even everywhere. "How then do they not obtain all things?" Because many are causes of their failing. For either they often ask things inexpedient. And why marvellest thou, if this is the case with some others, whereas it was so even with Paul, when he heard, "My grace is sufficient for thee; for my strength is perfected in weakness." Or they are unworthy to be reckoned with them that heard these words, and contribute not their own part, but He seeks for such as are like them; therefore He saith "of you," of the virtuous, of them that show forth an angelic rule of life. Or they pray against them that have aggrieved them, seeking for redress and vengeance; and this kind of thing is forbidden, for, "Pray," saith He, "for your enemies." Or having sins unrepented they ask mercy, which thing it is impossible to receive, not only if themselves ask it, but although others having much confidence towards God entreat for them, like as even Jeremiah praying for the Jews did hear, "Pray not thou for this people, because I will not hear thee."

But if all things are there, and thou ask things expedient, and contribute all thine own part, and exhibit an apostolical life, and have concord and love towards thy neighbor, thou wilt obtain on thy entreaty; for the Lord is loving towards man.

Then because He had said, "Of my Father," in order that He might show that it is Himself that giveth, and not He who begat Him only, He added, "For wheresoever two or three are gathered together in my name, there am I in the midst of them."

What then? are there not two or three gathered together in His name? There are indeed, but rarely. For not merely of the assembling doth He speak, neither this doth He require only; but most surely, as I said before also, the rest of virtue too together with this, and besides, even this itself He requires with great strictness. For what He saith is like this, "If any holds me the principal ground of his love to his neighbors, I will be with Him, if he be a virtuous man in other respects."

But now we see the more part having other motives of friendship. For one loves, because he is loved, another because he hath been honored, a third because such a one has been useful to him in some other worldly matter, a fourth for some other like cause; but for Christ's sake it is a difficult thing to find any one loving his neighbor sincerely, and as he ought to love him. For the more part are bound one to another by their worldly affairs. But Paul did not love thus, but for Christ's sake; wherefore even when not loved in such wise as he loved, he did not cease his love, because he had planted a strong root of his affection; but not so our present state, but on inquiry we shall find with most men anything likely to produce friendship rather than this. And if any one bestowed on me power in so great a multitude to make this inquiry, I would show the more part bound one to another by worldly motives.

(Verse 19, 20.) Again I say to you: if two of you agree on earth about anything they ask, it will be done for them by my Father in heaven. For where two or three are gathered in my name, there am I among them. The above discourse has encouraged us towards harmony. Therefore, it promises a reward so that we may hasten eagerly towards peace, as it says that it will be present among two or three. Similar to the example of a tyrant, who wanted to prove that he had captured two friends (when one returned to see his mother and gave his friend as a surety for himself), so he wanted to test one, and release the other. And when he returned on the appointed day, marveling at the faith of both, he asked that they have a third. We can also understand this spiritually, that where the spirit and soul and body agree and do not have war between themselves of different desires (or pleasures); with the flesh desiring against the spirit, and the spirit against the flesh, they obtain from the Father whatever they seek about any thing. And there is no doubt that the request of good things is certain, where the body wants to have those things which the spirit wants.

(vid. Origen. in loc.) We may also understand this spiritually; where our spirit, soul, and body are in agreement, and have not within them conflicting wills, they shall obtain from My Father every thing they shall ask; for none can doubt that that demand is good, where the body wills the same thing as the spirit.

Again verily I say unto you, That if two of you shall agree on earth as touching any thing that they shall ask, it shall be done for them of My Father Who is in heaven. For where two or three are gathered together in My name, there am I in the midst of them. By these words He draws us together in love. After forbidding us to give offence to each other, either to harm and to be harmed, now He speaks of mutual agreement and harmony. Those who agree are those who collaborate, not in evil, but in good. Mark what He said: "if two of you," that is, of believers who are virtuous. For Annas and Caiaphas also agreed, but in a manner deserving blame. This is why we often pray but do not receive, because we do not agree among each other. He did not say, "I will be there," for He does not merely intend to be there at some future time, nor does He delay, but rather He said, "there am I," that is, I am present at once. You may also understand that when the flesh and the spirit agree, and the flesh does not desire something in opposition to the spirit, then is the Lord there in the midst. And so also do the three faculties of the soul - the abilities to reason, to be stirred to action, and to desire - all agree. But the Old and the New agree as well and Christ is in their midst, proclaimed by both.

(ap. Anselm.) But He holds out a ratification not only of sentences of excommunication, but of every petition which is offered by men holding together in the unity of the Church; for He adds, Again I say unto you, that if two of you shall agree upon earth, whether in admitting a penitent, or casting out a forward person, touching any thing which they shall ask, any thing, that is, that is not against the unity of the Church, it shall be done for them by my Father which is in heaven. By saying, which is in heaven, He points Him out as above all, and therefore able to fulfil all that shall be asked of Him. Or, He is in the heavens, that is, with saints, proof enough that whatever worthy thing they shall ask shall be done unto them, because they have with them Him of whom they ask. For this cause is the sentence of those that agree together ratified, because God dwells in them, For where two or three are gathered together in my name, there am I in the midst of them.

Again I say to you, etc. Here he sets forth the efficacy of prayer. And first he does this; secondly, he gives the reason, at for where there are two, etc. He says again I say to you, etc. But against this you can object, because we ask for many things that we do not obtain. This happens first because of the unworthiness of those asking; hence he says two of you, namely, who live according to the Gospel. James 4:3: you ask, and receive not, because you ask amiss. Likewise, because they do not agree, because they do not have the bond of peace: for it is impossible that the prayers of many not be heard, if from many prayers there is made as it were one; 2 Cor 1:11: that from many persons thanks may be given by many on our behalf for the gift granted to us. Likewise, because some ask for things that are not expedient for their salvation: for the petition should be for something useful; below, 20:22: you know not what you ask.