The interpretation timeline
1 Peter 1:8 Douay-Rheims

Whom having not seen, you love: in whom also now, though you see him not, you believe: and believing shall rejoice with joy unspeakable and glorified;

A.D. 155 – 1871 5 witnesses 6 excerpts

Patristic

before A.D. 750
155
A.D.
Polycarp of Smyrna Patristic
c. A.D. 69–155
“I have greatly rejoiced with you in our Lord Jesus Christ, because ye have followed the example of true love [as displayed by God], and have accompanied, as became you, those who were bound in chains, the fitting ornaments of saints, and which are indeed the diadems of the true elect of God and our Lord; and because the strong root of your faith, spoken of in days long gone by, endureth even until now, and bringeth forth fruit to our Lord Jesus Christ, who for our sins suffered even unto death, [but] "whom God raised from the dead, having loosed the bands of the grave." "In whom, though now ye see Him not, ye believe, and believing, rejoice with joy unspeakable and full of glory;" into which joy many desire to enter, knowing that "by grace ye are saved, not of works," but by the will of God through Jesus Christ.”
Source
202
A.D.
Irenaeus Patristic
c. A.D. 130–202
“And Paul declares: "Not that I have already attained, or that I am justified, or already have been made perfect. For we know in part, and we prophesy in part; but when that which is perfect has come, the things which are in part shall be done away." As, therefore, when that which is perfect is come, we shall not see another Father, but Him whom we now desire to see (for "blessed are the pure in heart: for they shall see God"); neither shall we look for another Christ and Son of God, but Him who [was born] of the Virgin Mary, who also suffered, in whom too we trust, and whom we love; as Esaias says: "And they shall say in that day, Behold our Lord God, in whom we have trusted, and we have rejoiced in our salvation;" and Peter says in his Epistle: "Whom, not seeing, ye love; in whom, though now ye see Him not, ye have believed, ye shall rejoice with joy unspeakable;" neither do we receive another Holy Spirit, besides Him who is with us, and who cries, "Abba, Father;" and we shall make increase in the very same things [as now], and shall make progress, so that no longer through a glass, or by means of enigmas, but face to face, we shall enjoy the gifts of God...”
Source
“"For now," he says, "we know in part, and we prophesy in part, but then face to face." And this it is which has been said also by Peter: "Whom having not seen, ye love; in whom now also, not seeing, ye believe; and believing, ye shall rejoice with joy unspeakable." For our face shall see the face of the Lord and shall rejoice with joy unspeakable,-that is to say, when it shall behold its own Delight.”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“Whom having not seen, ye love,.... That is, Jesus Christ, whom they had never seen with their bodily eyes, being Jews, who dwelt not in Judea, when Christ was upon earth, but were scattered about in several parts of the Gentile world; and yet Christ being made known to them, through the preaching of the Gospel, they received and embraced him, and their affections were strongly set upon him: they loved him because of his excellencies and perfections, because of the loveliness of his person, and because he first loved them; they loved him because of the fulness of grace that was in him, because of what he had done for them, and was unto them, and because of the offices he sustained on their account, and the relations he stood in to them; they loved him above all creatures and things, and all of him, and that belong unto him, his people, truths, ordinances, ways, and worship; they loved him with all their hearts, and in the sincerity of their souls, though they had never seen his face in the flesh; whereas sight often begets and increases love: their love was not carnal, but spiritual; it was a fruit of the Spirit of God in their souls; was accompanied with faith in Christ, and proceeded upon the report the Gospel made of him: in whom, though now ye see him not, yet believing; the Arabic version adds, "in him": that is, in Christ, who was then received up into heaven, and must be retained there until the time of the restitution of all things; and therefore not now to be beheld with corporeal sight: and yet these regenerate ones, and lovers of Christ, believed in him; see Joh 20:29 not with a notional, historical, and temporary faith, believing not merely what he said, or did, or does, or will do; but looking on him, and to him, for life and salvation; going out of themselves to him, embracing of him, leaning upon him as their Saviour and Redeemer; venturing their souls upon him, committing their all unto him, expecting all from him, both grace and glory: and so rejoice with joy unspeakable and full of glory; with a joy in believing on him, which is better experienced than expressed; a joy that not only strangers intermeddle not with, know nothing of, which entirely passes their understanding, but is such as saints themselves cannot speak out, or give a full and distinct account of; they want words to express it, and convey proper ideas of it to others: and it is a joy that is glorious; there is a rejoicing that is evil and scandalous; but this is honourable, and of which none need be ashamed; it is solid and substantial, and the matter of it always abiding, when the joy of the hypocrite is but for a moment; it is a joy on account of the glory of God, which the believer lives in the hope and faith of; and it is a beginning, a presage and pledge of it; it is a glory begun here; it is the firstfruits, and a part also of it; and by it saints may know a little what heaven itself will be.”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“Whom having not seen, ye love - Those to whom the apostle wrote had never seen Christ in the flesh; and yet, such is the realizing nature of faith, they loved him as strongly as any of his disciples could, to whom he was personally known. For faith in the Lord Jesus brings him into the heart; and by his indwelling all his virtues are proved, and an excellence discovered beyond even that which his disciples beheld, when conversant with him upon earth. In short, there is an equality between believers in the present time, and those who lived in the time of the incarnation; for Christ, to a believing soul, is the same to-day that he was yesterday and will be for ever. Ye rejoice with joy unspeakable - Ye have unutterable happiness through believing; and ye have the fullest, clearest, strongest evidence of eternal glory. Though they did not see him on earth, and men could not see him in glory, yet by that faith which is the evidence of things not seen, and the subsistence of things hoped for, they had the very highest persuasion of their acceptance with God, their relation to him as their Father, and their sonship with Christ Jesus.”
Source
1871
A.D.
1871
“not having seen, ye love--though in other cases it is knowledge of the person that produces love to him. They are more "blessed that have not seen and yet have believed," than they who believed because they have seen. On Peter's own love to Jesus, compare Joh 21:15-17. Though the apostles had seen Him, they now ceased to know Him merely after the flesh. in whom--connected with "believing": the result of which is "ye rejoice" (Greek, "exult"). now--in the present state, as contrasted with the future state when believers "shall see His face." unspeakable-- (Co1 2:9). full of glory--Greek, "glorified." A joy now already encompassed with glory. The "glory" is partly in present possession, through the presence of Christ, "the Lord of glory," in the soul; partly in assured anticipation. "The Christian's joy is bound up with love to Jesus: its ground is faith; it is not therefore either self-seeking or self-sufficient" [STEIGER].”
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.