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Every tree that bringeth not forth good fruit is hewn down, and cast into the fire. 7:19
"Howbeit this kind goeth not out but by prayer and fasting." This verse was not in the original text, but was added later by a scribe to make it conform with Mark . That's why many modern translations omit it. 17:21
Only one more thing will happen before the end comes: the gospel will be preached throughout the world (14). Well, that and the abomination of desolations will stand in the holy place (15), many false Christs and false prophets will show great signs and wonders (24), the sun and moon will be darkened and the stars will fall (29), the sign of the son of Man will appear in the sky, everyone on earth will mourn, and then, finally, the great and powerful son of Man will come in all his glory (30).
Oh, and all these things will happen within the lifespan of Jesus' contemporaries (34).
Or maybe not. Jesus was talking about things he knew nothing about (36). (See Mark 13:32.) 24:3-51