Augustine of Hippo — as excerpted in the Catena Aurea on John 14:18-21

“(Tr. lxxv. 2) For the world saw Him then with the carnal eye, manifest in the flesh, though it did not see the Word hidden under the flesh. But after the resurrection He was unwilling to shew even His flesh, except to His own followers, whom He allowed to see and to handle it: Yet a little while, and the world seeth Me no more; but ye shall see Me. But, inasmuch as the world, by which are meant all who are aliens from His kingdom, will see Him at the last judgment, it is better perhaps to understand Him here as pointing to that time, when He will be taken for ever from the eyes of the wicked, to be seen thenceforth by those who love Him. A little while, He says, for that which seems a long time to men, is but a moment in the eyes of God.”