4 Hitherto in this section of the Gospel, whereon we are discoursing today, the tenor of everything has been, I may say, of easy understanding: a much closer attention is needful in connection with the words that follow. For what does He mean by the words, “And in that day you shall ask me nothing”? The verb to ask, used here, means not only to beg of, but also to question; and the Greek Gospel, of which this is a translation, has a word that may also be understood in both senses, so that by it the ambiguity is not removed; and even though it were so, every difficulty would not thereby disappear.
For we read that the Lord Christ, after He rose again, was both questioned and petitioned. He was asked by the disciples, on the eve of His ascension into heaven, when He would be manifested, and when the kingdom of Israel would come; and even when already in heaven, He was petitioned [asked] by St. Stephen to receive his spirit. And who dare either think or say that Christ ought not to be asked, sitting as He does in heaven, and yet was asked while He abode on earth? Or that He ought not to be asked in His state of immortality, although it was men's duty to ask Him while still in His state of subjection to death? Nay, beloved, let us ask Him to untie with His own hands the knot of our present inquiry, by so shining into our hearts that we may perceive what He says.
Source: Tractates on the Gospel of John (New Advent)