3 “These things,” said He, “have I spoken to you in proverbs: but the hour comes, when I shall no more speak unto you in proverbs, but I shall show you plainly of my Father.” I might be disposed to say that this hour, whereof He speaks, must be understood as that future period when we shall see openly, as the blessed Paul says, “face to face;” that what He says, “These things have I spoken to you in proverbs,” is one with what has been said by the same apostle, “Now we see through a glass, in a riddle:” and “I will show you,” because the Father shall be seen through the instrumentality of the Son, is akin to what He says elsewhere, “Neither knows any man the Father, save the Son, and [he] to whom the Son shall be pleased to reveal Him.” But such a sense seems to be interfered with by that which follows: “At that day you shall ask in my name.”
For in that future world, when we have reached the kingdom where we shall be like Him, for we shall see Him as He is, what shall we then have to ask, when our desire shall be satisfied with good things? As it is also said in another psalm: “I shall be satisfied when Your glory shall be revealed.” For petition has to do with some kind of want, which can have no place there where such abundance shall reign.
Source: Tractates on the Gospel of John (New Advent)