Give to him that asks you, and from him that would borrow of you turn not away.
All Commentaries on Matthew 5:42 Go To Matthew 5
Augustine of Hippo
AD 430
But since it is a small matter merely to abstain from injuring, unless you also confer a benefit as far as you can, He therefore goes on to say, Give to every one that asks you, and from him that would borrow of you turn not away. To every one that asks, says He; not, Everything to him that asks: so that you are to give that which you can honestly and justly give. For what if he should ask money, wherewith he may endeavour to oppress an innocent man? What if, in short, he should ask something unchaste? But not to recount many examples, which are in fact innumerable, that certainly is to be given which may hurt neither yourself nor the other party, as far as can be known or supposed by man; and in the case of him to whom you have justly denied what he asks, justice itself is to be made known, so that you may not send him away empty. Thus you will give to every one that asks you, although you will not always give what he asks; and you will sometimes give something better, when you have set him right who was making unjust requests.
Then, as to what He says, From him that would borrow of you turn not away, it is to be referred to the mind; for God loves a cheerful giver. Moreover, every one who accepts anything borrows, even if he himself is not going to pay it; for inasmuch as God pays back more to the merciful, whosoever does a kindness lends at interest. Or if it does not seem good to understand the borrower in any other sense than of him who accepts of anything with the intention of repaying it, we must understand the Lord to have included those two methods of doing a favour. For we either give in a present what we give in the exercise of benevolence, or we lend to one who will repay us. And frequently men who, setting before them the divine reward, are prepared to give away in a present, become slow to give what is asked in loan, as if they were destined to get nothing in return from God, inasmuch as he who receives pays back the thing which is given him. Rightly, therefore, does the divine authority exhort us to this mode of bestowing a favour, saying, And from him that would borrow of you turn not away: i.e., do not alienate your goodwill from him who asks it, both because your money will be useless, and because God will not pay you back, inasmuch as the man has done so; but when you do that from a regard to God's precept, it cannot be unfruitful with Him who gives these commands.