Thomas Aquinas

“ Quantity is inherent to the glorified body itself, nor would it be possible for the quantity to be altered at the soul's bidding without the glorified body suffering some alteration incompatible with its impassibility. Hence there is no comparison between quantity and visibility, because even this quality whereby it is visible cannot be removed at the soul's bidding, but the action of that quality will be suspended, and thus the body will be hidden at the soul's command. ”

“ Wherefore clarity which in the soul is spiritual is received into the body as corporeal. And consequently according to the greater clarity of the soul by reason of its greater merit, so too will the body differ in clarity, as the Apostle affirms (1 Cor. 15:41) . Thus in the glorified body the glory of the soul will be known, even as through a crystal is known the color of a body contained in a crystal vessel, as Gregory says on Job 28:17, "Gold or crystal cannot equal it." ”

“ Now intense clarity does not disturb the sight, in so far as it acts by the action of the soul, for thus it rather gives delight, but it disturbs it in so far as it acts by the action of nature by heating and destroying the organ of sight, and by scattering the spirits* asunder. ”

“ Further, just as quantity is something in a body, so is the quality whereby a body is seen. Now quantity will not be subject to the will, so that the glorified body be able to be of greater or smaller quantity. Therefore neither will the quality of visibility be subject to the will, so that a body be able not to be seen.
On the contrary, our body will be glorified in being made like to the body of Christ after the resurrection. Now after the resurrection Christ's body was not necessarily seen ”

“ Further, every body which hides other bodies that are behind it is necessarily perceived by the sight, from the very fact that the other things behind it are hidden. Now the glorified body will hide other bodies that are behind it from being seen, because it will be a colored body. ”