Theophylact of Bulgaria
Truly, I tell you, this generation will not fade away, referring to the generation of the faithful or Christians, “as all these things shall be”—everything pertaining to Jerusalem and the arrival of the Antichrist. The Lord does not refer to the apostolic generation, as the apostles will not endure until the end of times; in fact, many did not survive even until the fall of Jerusalem. Here, He is speaking of the Christian lineage as this generation, providing reassurance to the apostles. He wishes to alleviate their concerns that amidst such dire tribulations, faith might be utterly diminished. Therefore, the Lord assures them, “Be of good cheer; the race of the faithful shall not pass away, nor shall they be in want.”