When we read the apostolic testimony in the New Testament, we are hearing directly from Christ himself. It was not a generic spirit that inspired the words of Scripture. It was the Spirit of Christ that moved the authors to write what they wrote. Jesus describes the Spirit this way in John 15:26, “When the Helper comes, whom I will send to you from the Father…He will bear witness of Me.” This is the Spirit that Jesus sends to inspire the apostolic witness.
The apostle John explains to his readers how to tell the difference between the Spirit of God and the spirit of antichrist:
1 John 4:6 “We are from God; he who knows God listens to us; he who is not from God does not listen to us. By this we know the spirit of truth and the spirit of error.”
This means that if you want to know Jesus and if you want to know the truth, then you must listen to His apostolic witnesses. If you refuse to listen to and to believe in the apostolic portrait of Jesus, you are listening to the spirit of antichrist (1 John 4:3).
This is John’s expansion of what Jesus himself said in the upper room discourse. Jesus told his apostles that he would uniquely reveal himself to his apostles and would enable them to faithfully communicate his revelation to the world:
John 14:25 “But the Helper, the Holy Spirit, whom the Father will send in My name, He will teach you [apostles] all things, and bring to your remembrance all that I said to you.”
John 16:13 “But when He, the Spirit of truth, comes, He will guide you [apostles] into all the truth; for He will not speak on His own initiative, but whatever He hears, He will speak; and He will disclose to you what is to come.”