Augustine of Hippo
Catena Aurea · Lukasevangelium 21
And when these things begin to come to pass, then look up, and lift up your heads; for your redemption draweth nigh. And he spake to them a parable; Behold the fig tree, and all the trees; When they now shoot forth, ye see and know of your own selves that summer is now nigh at hand. So likewise ye, when ye see these things come to pass, know ye that the kingdom of God is nigh at hand. Verily I say unto you, This generation shall not pass away, till all be fulfilled. Heaven and earth shall pass away: but my words shall not pass away.
(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.