I have much more to tell you, but you cannot bear it now. But when he comes, the Spirit of truth, he will guide you to all truth.
But did that revelation of "all truth" end with the Bible?
On one level our answer is yes.
We believe that public revelation, revelation intended for all people, closed with the New Testament.
On a deeper level however we recognize that the work of the Holy Spirit is not finished. The catechism puts it this way,
no new public revelation is to be expected before the glorious manifestation of our Lord Jesus Christ. Yet even if Revelation is already complete, it has not been made completely explicit; it remains for Christian faith gradually to grasp its full significance over the course of the centuries. (Catechism,n. 66)
Just as the truths of the New Testament are implicit in the Old, and their full true meaning is only reveled in Christ, so to the deepest truths of the New Testament are still being reveled to us. The truth is there but we have yet to grasp it. We may only fully grasp it in eternal life.
Until then, we as individuals and a the one body of Christ, the Church, search. We read the Word of God, not in isolation but with the aid of centuries wisdom of all those who have gone before us. And we believe that the Holy Spirit continues to guide the search for the meaning of the scriptures within the Church.
None of us will achieve "all truth" in this life, but we should never stop searching for the deepest possible understanding of it.