John Chrysostom — as excerpted in the Catena Aurea on John 16:1-4

“(Hom. lxxviii) And He predicted these trials for another reason, viz. that they might not say that He had not foreseen them; That ye may remember that I told you of them, or that He had only spoken to please them, and given false hopes. And the reason is added, why He did not reveal these things sooner: And these things I said not unto you at the beginning, because I was with you; because, that is, ye were in My keeping, and might ask when you pleased, and the whole battle rested upon Me. There was no need then to tell you these things at the first, though I myself knew them.”