because those whom he foreknew he also predestined to be conformed to the image of his Son, that his Son would be the firstborn among many brothers and sisters.
[Rom 8:29 NET]
The risen body of Christ is the type to which the risen bodies of the saints are to be conformed, for “as we have borne the image of the earthy, we shall also bear the image of the heavenly.” This is that glorious image to which the saints are to be all conformed. But though fully retaining all the essential characteristics of humanity, for otherwise it would cease to be manhood in conjunction with Godhead, yet so unspeakably glorious is this risen body of the blessed Lord, to the image of which the risen saints will be conformed, that in this time-state we can not only form no conception of its surpassing glory, but not even of that inferior degree of glory which will clothe the bodies of the saints at the resurrection. “Beloved, now are we the sons of God, and it does not yet appear what we shall be—but we know that, when he shall appear, we shall be like him, for we shall see him as he is” (1 John 3:2).
But of this we may be sure, that there will always be an essential and unapproachable distinction between the glory of Christ’s humanity and theirs. His humanity, being in eternal union with his Deity, derives thence a glory which is distinct from all other, and to which there can be no approach, and with which there can be no comparison. The glory of the moon never can be the glory of the sun, though she shines with his reflected light. “He will change our vile body that it may be fashioned like unto his glorious body;” but though like, it will not be the same. It will be the saints’ eternal happiness to see him as he is, and to be made like unto him; but it will be their everlasting joy that he should ever have that pre-eminence of glory which is his birthright, and to adore which will ever be their supreme delight. To have a body free from all sin, sickness, and sorrow, filled to its utmost capacity of holiness and happiness, able to see him as he is without dying under the sight, and to be re-united to its once suffering but now equally glorified companion, an immortal soul, expanded to its fullest powers of joy and bliss—if this be not sufficient, what more can God give?