The interpretation timeline
Luke 6:32 Douay-Rheims

And if you love them that love you, what thanks are to you? for sinners also love those that love them.

A.D. 373 – 1832 7 witnesses 8 excerpts

Patristic

before A.D. 750
373
A.D.
c. A.D. 296–373
“(Orat. 3. cont. Arian.) That is to say, that we beholding His mercies, what good things we do should do them not with regard to men, but to Him, that we may obtain our rewards from God, not from men.”
395
A.D.
Gregory of Nyssa Patristic
c. A.D. 335–395
“(Orat. cont. usurar.) But man ought to shun that baneful anxiety with which he seeks from the poor man increase of his money and gold, exacting a profit of barren metals. Hence he adds, And lend, hoping for nothing again, &c. If a man should call the harsh calculation of interest, theft, or homicide, he will not err. For what is the difference, whether a man by digging under a wall become possessed of property, or possess it unlawfully by the compulsory rate of interest?”
Source
397
A.D.
Ambrose of Milan Patristic
A.D. 339–397
“Now philosophy seems to divide justice into three parts; one towards God, which is called piety; another towards our parents, or the rest of mankind; a third to the dead, that the proper rites may be performed. But the Lord Jesus passing beyond the oracle of the law, and the heights of prophecy, extended the duties of piety to those also who have injured us, adding, But love your enemies.”
Source
407
A.D.
John Chrysostom Patristic
A.D. 347–407
“(Hom. 58. in Gen.) Whereby thou wilt confer more upon thyself than him. For he is beloved by a fellow servant, but thou art made like unto God. But it is a mark of the greatest virtue when we embrace with kindness those who wish to do us harm. Hence it follows, And do good. For as water, when cast upon a lighted furnace, extinguishes it, so also reason joined with gentleness. But what water is to fire, such is lowliness and meekness to wrath; and as fire is not extinguished by fire, so neither is anger soothed by anger.”
Source
“(Hom. 3. in. Gen.) Observe the wonderful nature of lending, one receives and another binds himself for his debts, giving a hundred fold at the present time, and in the future eternal life.”
735
A.D.
Bede the Venerable Patristic
c. A.D. 672–735
“Either by giving them temporal gifts, or by inspiring His heavenly gifts with a wonderful grace.”

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“And if ye do good to them which do good to you,.... As one good turn deserves another: what thank have ye? what grace or goodness is there in such an action? what glory or merit is there in it? for sinners also do even the same: wherefore no man should conclude himself a righteous man, or better than sinners, on such an account: this is to be found among the worst of men, and is natural to them, unless they are brutes indeed, to be kind to such as are kind to them. And yet, this was the whole of the doctrine of the Jews about doing good to men: for so they say (u), "an Israelite is obliged to do good to an Israelite his companion, and to lend without usury: this is kindness and goodness, and a greater good it is than a gift; for many men are ashamed to take a gift, and are not ashamed to take a loan: but not so an Israelite to a Gentile; for he is not bound to do good, or show kindness to him, or to lend him his money freely; for many of them hate the Israelites; but it must be owned, that if a Gentile does a kindness, or good, to an Israelite; the Israelite is also bound to show kindness to him, and do him good.'' In direct opposition to such narrow sentiments does our Lord deliver himself in this, and the following verses. (u) Kimchi in Psal. xv. apud Huls. Theolog. Jud. par. 1. p. 420.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“For sinners also love those that love them - I believe the word ἁμαρτωλοι is used by St. Luke in the same sense in which τελωναι, tax-gatherers, is used by St. Matthew, Mat 5:46, Mat 5:47, and signifies heathens; not only men who have no religion, but men who acknowledge none. The religion of Christ not only corrects the errors and reforms the disorders of the fallen nature of man, but raises it even above itself: it brings it near to God; and, by universal love, leads it to frame its conduct according to that of the Sovereign Being. "A man should tremble who finds nothing in his life besides the external part of religion, but what may be found in the life of a Turk or a heathen." The Gospel of the grace of God purifies and renews the heart, causing it to resemble that Christ through whom the grace came. See the note on Luk 7:37.”
Source
Modern · 1953 →

The in-app commentary runs from the Fathers to the early-modern record, then stops — that's where the public-domain sources end, not where the reading does. For the modern reading, follow the sources directly.