The interpretation timeline
Revelation 3:19 Douay-Rheims

Such as I love, I rebuke and chastise. Be zealous therefore, and do penance.

A.D. 220 – 1871 5 witnesses 6 excerpts

Patristic

before A.D. 750
220
A.D.
Tertullian Patristic
c. A.D. 150–220
“Let us strive, then, to bear the injuries that are inflicted by the evil one, that the struggle to maintain our self-control may put to shame the enemy's efforts. If, however, through imprudence or even of our own free will we draw down upon ourselves some misfortune, we should submit with equal patience to that which we impute to ourselves. But if we believe God strikes some blow of misfortune, to whom would it be better that we manifest patience than to our Lord? In fact, more than this, it befits us to rejoice at being deemed worthy of divine chastisement: "As for me," he says, "those whom I love I chastise." Blessed is that servant upon whose correction the Lord insists, at whom he deigns to be angry, whom he does not deceive by omitting his admonition!”
Source
“Moreover, if we believe that some inflictions are sent on us by the Lord, to whom should we more exhibit patience than to the Lord? Nay, He teaches us to give thanks and rejoice, over and above, at being thought worthy of divine chastisement. "Whom I love," saith He, "I chasten." O blessed servant, on whose amendment the Lord is intent! with whom He deigns to be wroth!whom He does not deceive by dissembling His reproofs!On every side, therefore, we are bound to the duty of exercising patience, from whatever quarter, either by our own errors or else by the snares of the Evil One, we incur the Lord's reproofs.”
Source
258
A.D.
Cyprian Patristic
c. A.D. 200–258
“He who consoles the sinner with flattering blandishments furnishes the means for sinning and does not check transgressions but nourishes them. But he who rebukes at the same time that he instructs with firmer counsels urges a brother on to salvation. "Whom I love," says the Lord, "I rebuke and chastise." Thus also ought the priest of the Lord not to deceive by pretended submissions but to provide salutary remedies. A physician is unskilled who handles the swelling folds of wounds with a sparing hand and increases the poison inclosed within the deep recesses of the vital organs as he cares for it. The wound must be opened and cut and treated by a sterner remedy by cutting out the corrupting parts. Although the sick man, impatient by reason of his pain, cries out, shrieks and complains, he will give thanks afterwards, when he has experienced good health.”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“To him that overcometh,.... The lukewarmness, and self-confidence, and security of this state: will I grant to sit with me in my throne; at the close of this church state, which will be the last of this kind, consisting of imperfect saints, Christ will descend from heaven with the souls of all the righteous, and raise their bodies and unite them to them; which, with the living saints, will make one general assembly and church of the firstborn, all perfect soul and body; among these he will place his tabernacle, and fix his throne; and they being all made kings as well as priests to him, shall now reign on earth with him, and that for the space of a thousand years: and this is the blessing promised the overcomers in the Laodicean state, that when Christ shall set up his kingdom among men, and reign gloriously before his ancients, they shall sit on the same throne with him, or share with him in his kingdom and glory; see Rev 5:10, even as I also overcame; sin, Satan, the world, death, and hell: and am set down with my Father in his throne; in heaven, at his right hand; which is expressive of equality to him, distinction from him, communion with him, and of the honour and glory he is possessed of; but it is not on this throne that the saints will sit, only Christ sits on the same throne with the Father in heaven; it is on Christ's throne on earth, or in his personal reign there, that the saints shall sit down with him; and which honour they shall all have, all that are more than conquerors through him, and are made kings by him. And when this reign is over, then will follow the second resurrection, or the resurrection of the wicked, when will come on the judgment of the people, as Laodicea signifies; and when these, with the devils, will form themselves into the Gog and Magog army, and attack the beloved city, the church of glorified saints on earth, under Christ their King, which will issue in the everlasting destruction of the former; and thus these seven churches bring us to the end of all things.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“As many as I love - So it was the love he still had to them that induced him thus to reprehend and thus to counsel them. Be zealous - Be in earnest, to get your souls saved, They had no zeal; this was their bane. He now stirs them up to diligence in the use of the means of grace and repentance for their past sins and remissness.”
Source
1871
A.D.
1871
“(Job 5:17; Pro 3:11-12; Heb 12:5-6.) So in the case of Manasseh (Ch2 33:11-13). As many--All. "He scourgeth every son whom He receiveth. And shalt thou be an exception? If excepted from suffering the scourge, thou art excepted from the number of the sons" [AUGUSTINE]. This is an encouragement to Laodicea not to despair, but to regard the rebuke as a token for good, if she profit by it. I love--Greek, "philo," the love of gratuitous affection, independent of any grounds for esteem in the object loved. But in the case of Philadelphia (Rev 3:9), "I have loved thee" (Greek, "egapesa") with the love of esteem, founded on the judgment. Compare the note in my English Gnomon of BENGEL, Joh 21:15-17. I rebuke--The "I" in the Greek stands first in the sentence emphatically. I in My dealings, so altogether unlike man's, in the case of all whom I love, rebuke. The Greek, "elencho," is the same verb as in Joh 16:8, "(the Holy Ghost) will convince (rebuke unto conviction) the world of sin." chasten--"chastise." The Greek, "paideu," which in classical Greek means to instruct, in the New Testament means to instruct by chastisement (Heb 12:5-6). David was rebuked unto conviction, when he cried, "I have sinned against the Lord"; the chastening followed when his child was taken from him (Sa2 12:13-14). In the divine chastening, the sinner at one and the same time winces under the rod and learns righteousness. be zealous--habitually. Present tense in the Greek, of a lifelong course of zeal. The opposite of "lukewarm." The Greek by alliteration marks this: Laodicea had not been "hot" (Greek, "zestos"), she is therefore urged to "be zealous" (Greek, "zeleue"): both are derived from the same verb, Greek, "zeo," "to boil." repent--Greek aorist: of an act to be once for all done, and done at once.”
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.