John 14:26

But the Comforter, even the Holy Spirit, whom the Father will send in my name, he shall teach you all things, and bring to your remembrance all that I have said unto you.

Teaching the apostles all things and bringing to their remembrance all that Jesus taught are parallel. Christ's message to men was perfect and complete; and the function of the Holy Spirit even in the apostles, was not that of continuing an incomplete revelation but of aiding their remembrance of the complete revelation already delivered. This promise of guiding into "all truth" pertained only to the apostles. Jesus never promised that the Holy Spirit would guide the Christians of all ages into the truth, except in the limited context of this original promise, ENABLING them to REMEMBER what Jesus taught; and this is still the work of the Spirit.

The Spirit of God enabled the memory of the apostles to deliver to humanity THE THINGS JESUS SAID, those being the things they HEARD him say. The notion that the Spirit guides men in spiritual things in any manner of contradicting or going beyond the Scriptures is wrong. The apostles themselves taught Christians "not to go beyond the things which are written" (1 Corinthians 4:6). This truth needs emphasis today. As Lipscomb said:

The ground of our certainty of the word of God is that the Spirit guided into the truth stated. All departure from the word of God concerning entrance into the church and into Christ comes from the idea that the Spirit teaches men outside the word of God ... TO give up the word of God as the only direction and guidance of the Holy Spirit is to give loose rein to dreams, imaginations, reasonings, and philosophies of men.[18]

Concerning the theory that the Spirit speaks "of himself" and apart from the word of God, see under John 16:13.

All things that I have said unto you ... What Jesus taught is the one true foundation of Christianity. Other passages bearing on this are: "these sayings of mine" (Matthew 7:24-26), "first spoken by the Lord" (Hebrews 2:3), and "whatsoever I have commanded you" (Matthew 28:20). See my Commentary on Matthew, en loco.