This an interesting phrase used in our text for today. We might say “a hugeness of glory,” or “an enormity of glory, or “an immensity of glory.” It refers to the glory that is ours in the resurrection, when we will be like our Savior and we will bask in the everlasting approval of our gracious Lord. Paul is telling us that compared to this weight of glory all trouble is light and momentary. One of the best reflections on this that I have ever read is from C.S. Lewis.
… It may be possible for each to think too much of his own potential glory hereafter; it is hardly possible for him to think too often or too deeply about that of his neighbour. The load, or weight, or burden of my neighbour’s glory should be laid daily on my back, a load so heavy that only humility can carry it, and the backs of the proud will be broken. It is a serious thing to live in a society of possible gods and goddesses, to remember that the dullest and most uninteresting person you talk to may one day be a creature which, if you saw it now, you would be strongly tempted to worship, or else a horror and a corruption such as you now meet, if at all, only in a nightmare. All day long we are, in some degree, helping each other to one or other of these destinations. It is in the light of these overwhelming possibilities, it is with the awe and the circumspection proper to them, that we should conduct all our dealings with one another, all friendships, all loves, all play, all politics. There are no ordinary people. You have never talked to a mere mortal. Nations, cultures, arts, civilization—these are mortal, and their life is to ours as the life of a gnat. But it is immortals whom we joke with, work with, marry, snub, and exploit—immortal horrors or everlasting splendours. (“The Weight of Glory” by C.S. Lewis. Preached originally as a sermon in the Church of St. Mary the Virgin, Oxford, on June 8, 1942: published in Theology, November, 1941, and by the S.P.C.K, 1942)