Howbeit when he, the Spirit of truth, is come, he will guide you into all truth: for he shall not speak of himself; but whatsoever he shall hear, that shall he speak: and he will shew you things to come.
The work which Christ began was to be continued by the Spirit of truth. He would guide the disciples into all truth. There is a sense in which all truth was committed to the apostles in their lifetime. They, in turn, committed it to writing, and we have it today in the New Testament. The New Testament, added to the Old Testament, completed God’s written revelation to us. The Spirit will guide us into the truths of God’s written word.