John Wesley on Matthew 24:29

Immediately after the tribulation of those days - Here our Lord begins to speak of his last coming. But he speaks not so much in the language of man as of God, with whom a thousand years are as one day, one moment. Many of the primitive Christians not observing this, thought he would come immediately, in the common sense of the word: a mistake which St. Paul labours to remove, in his Second Epistle to the Thessalonians. The powers of the heavens - Probably the influences of the heavenly bodies. Mark 13:24; Luke 21:25.