The interpretation timeline
Luke 21:31 Douay-Rheims

So you also, when you shall see these things come to pass, know that the kingdom of God is at hand.

A.D. 378 – 1832 4 witnesses

Patristic

before A.D. 750
378
A.D.
Titus of Bostra Patristic
d. c. A.D. 378
“Or else, He says, the kingdom of God is at hand, meaning that when these things shall be, not yet shall all things come to their last end, but they shall be already tending towards it. For the very coming of our Lord itself, casting out every principality and power, is the preparation for the kingdom of God.”
430
A.D.
Augustine of Hippo Patristic
A.D. 354–430
“(ut sup.) But when He says, When ye shall see these things to come to pass, what can we understand but those things which were mentioned above. But among them we read, And then shall they see the Son of man coming. When therefore this is seen, the kingdom of God is not yet, but nigh at hand. Or must we say that we are not to understand all the things before mentioned, when He says, When ye shall see these things, &c. but only some of them; this for example being excepted, And then shall they see the Son of man. But Matthew would plainly have it taken with no exception, for he says, And so ye, when ye see all these things, among which is the seeing the coming of the Son of man; in order that it may be understood of that coming whereby He now comes in His members as in clouds, or in the Church as in a great cloud.”
Source

Post-Reformation

c. 1650 – 1900
1771
A.D.
John Gill Reformed
1697–1771
“And all the people came early in the morning,.... Not all the people in Jerusalem, every inhabitant of the city; this word "all", is often to be taken with a restriction, and here it designs a large number; the Persic version renders it, "vast multitudes": these, some out of curiosity, and others from a real love to him, and his ministry, rose betimes, and came early, to him in the temple, to hear him; which is said, in commendation of Christ's hearers, and is worthy of imitation; as the former verse is a commendation of the preacher, in his constancy and diligence in his work, and following it with his prayers. Next: Luke Chapter 22”
Source
1832
A.D.
Adam Clarke Methodist
1762–1832
“The kingdom of God is nigh at hand - After the destruction of the Jewish state, the doctrine of Christ crucified shall be preached every where, and every where prevail.”
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.