The interpretation timeline
Revelation 22:12 Douay-Rheims

Behold, I come quickly; and my reward is with me, to render to every man according to his works.

A.D. 99 – 1871 5 witnesses

Patristic

before A.D. 750
99
A.D.
Clement of Rome Patristic
d. A.D. 99
“What shall we do, then, brethren? Shall we become slothful in well-doing, and cease from the practice of love? God forbid that any such course should be followed by us! But rather let us hasten with all energy and readiness of mind to perform every good work. For the Creator and Lord of all Himself rejoices in His works. For by His infinitely great power He established the heavens, and by His incomprehensible wisdom He adorned them. He also divided the earth from the water which surrounds it, and fixed it upon the immoveable foundation of His own will. The animals also which are upon it He commanded by His own word into existence. So likewise, when He had formed the sea, and the living creatures which are in it, He enclosed them [within their proper bounds] by His own power. Above all, with His holy and undefiled hands He formed man, the most excellent [of His creatures], and truly great through the understanding given him-the express likeness of His own image. For thus says God: "Let us make man in Our image, and after Our likeness. So God made man; male and female He created them." [Genesis 1:26-27] Having thus finished all these things, He approved them, and blessed them, and said, "Increase and multiply." [Genesis 1:28] We see, then, how all righteous men have been adorned with good works, and how the Lord Himself, adorning Himself with His works, rejoiced. Having therefore such an example, let us without delay accede to His will, and let us work the work of righteousness with our whole strength. The good servant receives the bread of his labour with confidence; the lazy and slothful cannot look his employer in the face. It is requisite, therefore, that we be prompt in the practice of well-doing; for of Him are all things. And thus He forewarns us: "Behold, the Lord [cometh], and His reward is before His face, to render to every man according to his work." He exhorts us, therefore, with our whole heart to attend to this, that we be not lazy or slothful in any good work. Let our boasting and our confidence be in Him. Let us submit ourselves to His will. Let us consider the whole multitude of His angels, how they stand ever ready to minister to His will. For the Scripture saith, "Ten thousand times ten thousand stood around Him, and thousands of thousands ministered unto Him, [Daniel 7:10] and cried, Holy, holy, holy, [is] the Lord of Sabaoth; the whole creation is full of His glory." [Isaiah 6:3] And let us therefore, conscientiously gathering together in harmony, cry to Him earnestly, as with one mouth, that we may be made partakers of His great and glorious promises. For [the Scripture] saith, "Eye hath not seen, nor ear heard, neither have entered into the heart of man, the things which He hath prepared for them that wait for Him." [1 Corinthians 2:9]”
Source
215
A.D.
c. A.D. 150–215
“The man of understanding and perspicacity is, then, a Gnostic. And his business is not abstinence from what is evil (for this is a step to the highest perfection), or the doing of good out of fear. For it is written, "Whither shall I flee, and where shall I hide myself from Thy presence? If I ascend into heaven, Thou art there; if I go away to the uttermost parts of the sea, there is Thy right hand; if I go down into the depths, there is Thy Spirit." Nor any more is he to do so from hope of promised recompense. For it is said, "Behold the Lord, and His reward is before His face, to give to every one according to his works; what eye hath not seen, and ear hath not heard, and hath not entered into the heart of man what God hath prepared for them that love Him." But only the doing of good out of love, and for the sake of its own excellence, is to be the Gnostic's choice.”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“And, behold, I come quickly,..... This is repeated, to confirm the truth of Christ's second coming, and the speediness of it, and to point at the time when the above shall be, and to add what follows. And my reward is with me: which words are taken out of Isa 40:10 and which being compared together, furnish out a clear proof of Christ being the true Jehovah, the eternal God. There is a reward of debt, or a due reward, a reward of punishment, which is the just recompense of reward, which, shall be righteously given to wicked men for their sin, Heb 2:2 and there is a reward of grace, which is also called the recompence of reward, the reward of the inheritance, which is no other than the gift of eternal life, which God of his free grace bestows upon his people, Heb 11:26 and both these are with Christ; they are in his hands, he has authority from God, as Mediator, to inflict vengeance on the wicked, and to give eternal life to his people; both which he will do, for this is with him: to give every man according as his work shall be; if his work is evil, and he is an unjust and filthy man, and the course of his conversation has been vicious, the reward of debt, or just punishment, will be rendered to him; but if his work is the fruit of grace, and he has had his conversation in the world by the grace of God, and he is a righteous person, justified by the righteousness of Christ, and a holy, good man, sanctified by the Spirit of God, the reward of grace, the crown of righteousness, will be given to him.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“Behold, I come quickly - I come to establish nay cause, comfort and support my followers, and punish the wicked.”
1871
A.D.
1871
“And--in none of our manuscripts. But A, B, Vulgate, Syriac, Coptic, and CYPRIAN omit it. behold, I come quickly--(Compare Rev 22:7). my reward is with me-- (Isa 40:10; Isa 62:11). to give--Greek, "to render." every man--Greek, "to each." shall be--so B in MAI. But B in TISCHENDORF, and A, Syriac, read, "is."”
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.