To sum up briefly what has been spoken: There are three things to be considered concerning the glory of Christ, three degrees in its manifestation, — the shadow, the perfect image, and the substance itself. Those under the Law had only the shadow of it, and of the things that belong unto it; — they had not the perfect image of them, Heb. x. 1. Under the Gospel we have the perfect image, which they had not; or a clear, complete revelation and declaration of it, presenting it unto us as in a glass: but the enjoyment of these things in their substance is reserved for heaven; we must be “where he is, that we may behold his glory.” Now, there is a greater difference and distance between the real substance of any thing and the most perfect image of it, than there is between the most perfect image and the lowest shadow of the same thing. If, then, they longed to be freed from their state of types and shadows, to enjoy the representation of the glory of Christ in that image of it which is given us in the Gospel; much more ought we to breathe and pant after our deliverance from beholding it in the image of it, that we may enjoy the substance itself. For, whatever can be manifest of Christ on this side heaven, it is granted unto us for this end, that we may the more fervently desire to be present with him.
The Glory of Christ (Edinburgh, Scotland; Banner of Truth Trust; 1965) Chapter 12.