15 Now ye Philippians know also, that in the beginning of the gospel, when I departed from Macedonia, no church communicated with me as concerning giving and receiving, but ye only.
He recalls these acts in order that, hearing that their good works are still held in mind and praised, they may have no doubt that they are counted acceptable in the Lord’s sight, adding zeal in faith to their generosity.
Lo, how great is his commendation! For the Corinthians and Romans are stirred up by hearing these things from him, while the Philippians did it without any other Church having made a beginning. For "in the beginning of the Gospel," says he, they manifested such zeal towards the holy Apostle, as themselves first to begin, without having any example, to bear this fruit. And no one can say that they did these things because he abode with them, or for their own benefit; for he says, "When I departed from Macedonia, no Church had fellowship with me, in the matter of giving and receiving, but you only." What means "receiving," and what "had fellowship"? Wherefore said he not, "no Church gave to me," but "had fellowship with me, in the matter of giving and receiving"? Because it is a case of communication. He says, "If we sowed unto you spiritual things, is it a great matter if we shall reap your carnal things." [1 Corinthians 9:11] And again, "That your abundance may be a supply to their want." [2 Corinthians 8:14] How did they communicate? In the matter of giving carnal things, and receiving spiritual. For as they who sell and buy communicate with each other, by mutually giving what they have, (and this is communication,) so too is it here. For there is not anything more profitable than this trade and traffic. It is performed on the earth, but is completed in heaven. They who buy are on the earth, but they buy and agree about heavenly things, while they lay down an earthly price.
But despond not; heavenly things are not to be bought with money, riches cannot purchase these things, but the purpose of him who gives the money, his true wisdom, his superiority to earthly things, his love toward man, his mercifulness. For if money could purchase it, she who threw in the two mites would have gained nothing great. But since it was not the money, but the purpose that availed, she received everything, who exhibited a full purpose of mind. Let us not then say, that the Kingdom can be bought with money; it is not by money, but by purpose of mind which is exhibited by the money. Therefore, will one answer, there is no need of money? There is no need of money, but of the disposition; if you have this, you will be able even by two mites to purchase Heaven; where this is not, not even ten thousand talents of gold will be able to do that, which the two mites could. Wherefore? Because if you who hast much throwest in but a small portion, you gave an alms indeed, but not so great as the widow did; for thou did not throw it in with the same readiness as she. For she deprived herself of all she had, or rather she deprived not, but gave it all as a free gift to herself. Not for a cup of cold water has God promised the kingdom, but for readiness of heart; not for death, but for purpose of mind. For indeed it is no great thing. For what is it to give one life? That is giving one man; but one man is not of worth enough.
What a great eulogy! What the Corinthians and Romans could have done had they been inspired by hearing of this! But no other church took the lead before the Philippians acted. Even in the beginning of the gospel they were already zealous on the saints’ behalf. Even when they had no good examples before them they were the first to bear this fruit.
The principle by which they entered this partnership was: Give useful gifts and receive back better spiritual gifts. You know how those who buy and sell hold conversation with one another in order to exchange their wares. This is what is happening here. There is nothing, nothing at all, more profitable than this sort of buying and selling. It begins on earth but ends in heaven.
[AD 384] Ambrosiaster on Philippians 4:15