No man can teach you the knowledge of God. God may use teachers—apostles or what not—to guard and guide you in a way; but you can be confident that as to the true knowledge of God no one can teach you short of God Himself, that is, the Spirit of God. Hence, the love of God is shed abroad in our hearts by the Holy Spirit. The Spirit has been pleased to take the place of the truth down here, not objectively like Christ, but subjectively, that the saints may have the gain of the revelation which God has given of Himself in the only-begotten Son. Christ has communicated the Spirit to be living water in the believer—a well of water springing up into everlasting life.
(F E Raven, NS vol. 15 p129