Jesus says 29"the sun will be darkened, and the moon will not give its light, and the stars will fall from heaven." Isaiah used similar language for the fall of Babylon (Isaiah 13:10) and for God's judgment on the nations (Isaiah 34:4). When a world order that seemed permanent collapsed, the prophets reached for the whole sky, because the fall of such a kingdom felt like the universe coming undone. Jesus uses the same language here. Darkness had covered the land once before, for three hours on the day he died (Matthew 27:45). The sky that marked his apparent defeat becomes the backdrop to his return.
The sign is the Son of Man himself, and 30"they will see the Son of Man coming on the clouds of heaven with power and great glory." The language comes from Daniel's vision of one like a son of man who receives dominion, glory, and a kingdom that will never pass away (Daniel 7:13-14). All the tribes of the earth will mourn, and the line recalls Zechariah's prophecy that they will look on the one they have pierced (Zechariah 12:10), a verse John applies to the cross (John 19:37). The one who was crucified and the one coming in glory are the same person. Mourning meets him first, because recognition arrives late for those who refused it while there was time.
The part of the passage built for comfort follows. His angels will sound a loud trumpet call, and 31"they will gather his elect from the four winds, from one end of heaven to the other." The trumpet in Israel's Scripture calls scattered people home (Isaiah 27:13). Believers across every continent and century, those who died alone and those who died surrounded, are all in view. No one who belongs to him will be missed.
Then comes the simplest illustration: 32"as soon as its branch becomes tender and puts out its leaves, you know that summer is near." The leaves announce summer without a calendar. Jesus offers no date, only a pattern of leaves, and says the disciples will know he is near, 33"at the very gates." Then comes one of the hardest sayings in this Gospel: 34"this generation will not pass away until all these things take place." Within a generation Jerusalem's temple fell, as he said in the opening of this chapter (Matthew 24:2). Readers differ about how far the saying reaches, and a promise already kept in public is worth trusting for whatever remains.
The passage builds to a sentence about his words. Heaven and earth are made things, and they pass away. Isaiah said the word of our God stands forever (Isaiah 40:8). Jesus applies that permanence to his own words. Every part of the scene, the sun, the moon, the stars, the heavens, is said to pass, and his words alone are exempt.
The darkened sky that once hung over a cross now frames the return of the one who hung there. Every word he has spoken, warning and promise, will outlast the sky. Pick one promise of Christ and lean your weight on it today.
Prayer
Father, when even the most permanent things begin to shake, remind us that your Son's words do not share that fate. Thank you that the Christ who was pierced for us will return for us, visibly and unmistakably, gathering every one of your people. Let us build our lives on the one thing this passage says will outlast everything else, his word. In Jesus' name, amen.