SPIRIT SPEAKING TO SPIRIT. The Spirit of God speaking to the spirit of man has power to impart truth with greater effect and understanding than the truth can be imparted by personal contact even with heavenly beings. Through the Holy Ghost the truth is woven into the very fibre and sinews of the body so that it cannot be forgotten. So positive and powerful are the teachings of the Spirit that when a man receives this knowledge and partakes of this power of God, which can only come after receiving the covenants and obligations belonging to the new and everlasting covenant, and he then turns away from this knowledge and these covenants, he sins knowingly.
(Joseph Fielding Smith, Doctrines of Salvation, 3 vols., edited by Bruce R. McConkie, 1:, p.47)