Take heed that you give not your alms before men, to be seen of them: otherwise you have no reward of your Father who is in heaven.
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Augustine of Hippo
AD 430
i.e., take heed that you do not live righteously with this intent, and that you do not place your happiness in this, that men may see you. Otherwise you have no reward of your Father who is in heaven: not if you should be seen by men; but if you should live righteously with the intent of being seen by men. For, [were it the former], what would become of the statement made in the beginning of this sermon, You are the light of the world. A city that is set on an hill cannot be hid. Neither do men light a candle, and put it under a bushel, but on a candlestick; and it gives light unto all that are in the house. Let your light so shine before men, that they may see your good works? But He did not set up this as the end; for He has added, and glorify your Father who is in heaven. But here, because he is finding fault with this, if the end of our right actions is there, i.e. if we act rightly with this design, only of being seen of men; after He has said, Take heed that you do not your righteousness before men, He has added nothing. And hereby it is evident that He has said this, not to prevent us from acting rightly before men, but lest perchance we should act rightly before men for the purpose of being seen by them, i.e. should fix our eye on this, and make it the end of what we have set before us.
For the apostle also says, If I yet pleased men, I should not be the servant of Christ; while he says in another place, Please all men in all things, even as I also please all men in all things. And they who do not understand this think it a contradiction; while the explanation is, that he has said he does not please men, because he was accustomed to act rightly, not with the express design of pleasing men, but of pleasing God, to the love of whom he wished to turn men's hearts by that very thing in which he was pleasing men. Therefore he was both right in saying that he did not please men, because in that very thing he aimed at pleasing God: and right in authoritatively teaching that we ought to please men, not in order that this should be sought for as the reward of our good deeds; but because the man who would not offer himself for imitation to those whom he wished to be saved, could not please God; but no man possibly can imitate one who has not pleased him. As, therefore, that man would not speak absurdly who should say, In this work of seeking a ship, it is not a ship, but my native country, that I seek: so the apostle also might fitly say, In this work of pleasing men, it is not men, but God, that I please; because I do not aim at pleasing men, but have it as my object, that those whom I wish to be saved may imitate me. Just as he says of an offering that is made for the saints, Not because I desire a gift, but I desire fruit; i.e., In seeking your gift, I seek not it, but your fruit. For by this proof it could appear how far they had advanced Godward, when they offered that willingly which was sought from them not for the sake of his own joy over their gifts, but for the sake of the fellowship of love.
Although when He also goes on to say, Otherwise you have no reward of your Father who is in heaven, He points out nothing else but that we ought to be on our guard against seeking man's praise as the reward of our deeds, i.e. against thinking we thereby attain to blessedness.