John 16:12-13a:
12 “I have much more to tell you, but you cannot bear it now. 13 But when he comes, the Spirit of truth, he will guide you to all truth.
A footnote in the NABRE explains that Jesus is not saying the Spirit will predict the future, but that the Spirit will illuminate Jesus’ teachings. Those teachings are permanent, but historical circumstances and advances and changes in human thought will arise, asking questions that would never have occurred to the disciples to ask Jesus in his earthly lifetime. We should understand that this “guiding” will be, as was Jesus’ ministry, an ongoing struggle against all kinds of misunderstanding and ill-will. In all the days of every Christian generation. Our current situation is… normal.