Augustine of Hippo — as excerpted in the Catena Aurea on Luke 21:28-33

“(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.”