During the fourth day of my week-long spiritual retreat we talked about the promise of Jesus to send the spirit of truth to teach all the truth. I can recommend all to search for these teaching.
I have yet many things to say unto you, but ye cannot bear them now. 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. He shall glorify me: for he shall receive of mine, and shall shew it unto you. (John 16:12-14)
I would be happy to. Fist of all, Jesus is frustrated with His disciples because after all their time together, they still did not understand what He was teaching. John understood Him best, but even he could not accept the gravity of the King of Heaven incarnation as human.
Jesus Christ, the King of Heaven, came to Earth to conquer the god of the dead (Mark 12:27) and free the fallen souls from his grasp. Even today, few people can accept the concept that the billions of souls that have incarnated on Earth are all fallen souls, who were once in Heaven. We all followed Satan and were cast out of Heaven, long ago.
Jesus had only 3 years to try to teach them, and He knew there was much too much to teach, so He promised to send the spirit of truth to teach all the truth. The first appearance of the spirit of truth was in the second century, who explained the Fall and reason from Christ’s redemption. The work was called The Restoration of All Things. The Roman Empire destroyed this work, but Jesus promised that His word would never die. So, the spirit of truth has appeared numerous time to restore what the likes of Constantine and Justinian did to Christianity. The latest appearance was 70 years ago at GL Zurich.
The spirit of truth taught from 1948 to 1983 and all 2,000 lectures were recorded, transcribed and published online, full searchable. Anyone can test the spirts (1 John 4:1–4) by reading all of the lectures and trying to find any contradictions in them.