Matthew 11:11, no one could prepare John for such an important position, so the Lord taught him personally. John was in the deserts until he was thirty years old. He was tutored directly by the Lord through the Holy Spirit.
The personal touch of the Lord became very obvious. Six months after John began his ministry, the whole nation of Israel was experiencing revival and anticipating the coming of the Christ. When Jesus came, the Jews wondered how he could know things he was never taught (John 7:15).
This special knowledge which comes directly from the Lord through the Holy Spirit is now available to every believer.
It's a part of the new covenant (Hebrews 8:11). The Holy Spirit has been sent to be our teacher, but we have to show up at class and expect to receive (John 14:26). He'll even show us things to come (John 16:13).