Wm. Barclay comments on 1 John 3.1-2:
“John, then, begins by reminding his people of the privileges of the Christian life. He goes on to set before them what is in many ways a still more tremendous truth, the great fact that this life is only a beginning. Here John observes the only true agnosticism. So great is the future and its glory that he will not even guess at it or try to put it into inevitably inadequate words. But there are certain things he does say about it.”
Some of Barclay’s following comments are quite deficient in truth, but the very challenge of understanding our future glory speaks volumes about its marvelous nature. So much better will it be!