But when you give alms, let not your left hand know what your right hand does:
All Commentaries on Matthew 6:3 Go To Matthew 6
Augustine of Hippo
AD 430
If you should understand unbelievers to be meant by the left hand, then it will seem to be no fault to wish to please believers; while nevertheless we are altogether prohibited from placing the fruit and end of our good deed in the praise of any men whatever. But as regards this point, that those who have been pleased with your good deeds should imitate you, we are to act before the eyes not only of believers, but also of unbelievers, so that by our good works, which are to be praised, they may honour God, and may come to salvation. But if you should be of opinion that the left hand means an enemy, so that your enemy is not to know when you do alms, why did the Lord Himself, when His enemies the Jews were standing round, mercifully heal men? Why did the Apostle Peter, by healing the lame man whom he pitied at the gate Beautiful, bring also the wrath of the enemy upon himself, and upon the other disciples of Christ? Then, further, if it is necessary that the enemy should not know when we do our alms, how shall we do with the enemy himself so as to fulfil that precept, If your enemy be hungry, give him bread to eat; and if he be thirsty, give him water to drink?
A third opinion is wont to be held by carnal people, so absurd and ridiculous, that I would not mention it had I not found that not a few are entangled in that error, who say that by the expression left hand a wife is meant; so that, inasmuch as in family affairs women are wont to be more tenacious of money, it is to be kept hidden from them when their husbands compassionately spend anything upon the needy, for fear of domestic quarrels. As if, forsooth, men alone were Christians, and this precept were not addressed to women also! From what left hand, then, is a woman enjoined to conceal her deed of mercy? Is a husband also the left hand of his wife? A statement most absurd. Or if any one thinks that they are left hands to each other; if any part of the family property be expended by the one party in such a way as to be contrary to the will of the other party, such a marriage will not be a Christian one; but whichever of them should choose to do alms according to the command of God, whomsoever he should find opposed, would inevitably be an enemy to the command of God, and therefore reckoned among unbelievers,— the command with respect to such parties being, that a believing husband should win his wife, and a believing wife her husband, by their good conversation and conduct; and therefore they ought not to conceal their good works from each other, by which they are to be mutually attracted, so that the one may be able to attract the other to communion in the Christian faith. Nor are thefts to be perpetrated in order that God may be rendered propitious. But if anything is to be concealed as long as the infirmity of the other party is unable to bear with equanimity what nevertheless is not done unjustly and unlawfully; yet, that the left hand is not meant in such a sense on the present occasion, readily appears from a consideration of the whole section, whereby it will at the same time be discovered what He calls the left hand.