The third member of the Godhead (1 Jn. 5: 7; D&C 20: 28). He is a personage of Spirit, not having a body of flesh and bones (D&C 130: 22). The Holy Ghost is often referred to as the Spirit, or the Spirit of God.

The Holy Ghost performs several vital roles in the plan of salvation.¹ He bears witness of the Father and the Son (1 Cor. 12: 3; 3 Ne. 28: 11; Ether 12: 41).² He reveals the truth of all things (John 14: 26; 16: 13; Moro. 10: 5; D&C 39: 6).³ He sanctifies those who have repented and become baptized (John 3: 5; 3 Ne. 27: 20; Moses 6: 64-68).⁴ He is the Holy Spirit of Promise (D&C 76: 50-53; 132: 7, 18-19, 26).

The power of the Holy Ghost can come upon a person before baptism and witness that the gospel is true. But the right to have the constant companionship of the Holy Ghost, whenever one is worthy, is a gift that can be received only by the laying on of hands by a Melchizedek Priesthood holder after authorized baptism into the true Church of Jesus Christ.

Jesus taught that all sins could be forgiven except blasphemy against the Holy Ghost (Matt. 12: 31-32; Mark 3: 28-29; Luke 12: 10; Heb. 6: 4-8; D&C 76: 34-35).

The Spirit causes men to walk in God’s statutes, Ezek. 36: 27. The Apostles were commissioned to baptize in the name of the Father, Son, and the Holy Ghost, Matt. 28: 19. The Holy Ghost shall teach you all things, John 14: 26. Holy men spake as they were moved by the Holy Ghost, 2 Pet. 1: 21. Nephi was led by the Spirit, 1 Ne. 4: 6. The mysteries of God shall be unfolded unto them by the power of the Holy Ghost, 1 Ne. 10: 17-19. The Holy Ghost shows all things that you should do, 2 Ne. 32: 5. By the power of the Holy Ghost ye may know the truth of all things, Moro. 10: 5. The Holy Ghost will tell you in your mind and in your heart, D&C 8: 2. The Spirit leadeth to do good, D&C 11: 12. The Holy Ghost knoweth all things, D&C 35: 19. The Holy Ghost teaches the peaceable things of the kingdom, D&C 36: 2 (D&C 39: 6). If ye receive not the Spirit, ye shall not teach, D&C 42: 14. The Holy Ghost beareth record of the Father and the Son, D&C 42: 17 (1 Cor. 12: 3; 3 Ne. 11: 32, 35-36). To some it is given by the Holy Ghost to know that Jesus Christ is the Son of God, D&C 46: 13. Whatsoever they shall speak when moved upon by the Holy Ghost shall be scripture, D&C 68: 4. The Holy Ghost shall be shed forth in bearing record unto all things ye shall say, D&C 100: 8. The Holy Ghost shall be thy constant companion, D&C 121: 45-46.