The Holy Ghost is the third member of the Godhead.
- The Holy Ghost is a personage of spirit and possesses all the characteristics of a divine personality (see D&C 130:22; 1 Nephi 11:11).
- The Holy Ghost knows all things (see D&C 35:19; Moroni 10:5; Moses 6:61).
- The Holy Ghost testifies of the Father and the Son (see D&C 20:27; 3 Nephi 28:11).
“The Holy Ghost is the third member of the Godhead. He is a Spirit, in the form of a man. … The Holy Ghost is a personage of Spirit, and has a spirit body only. His mission is to bear witness of the Father and the Son and of all truth.
“As a Spirit personage the Holy Ghost has size and dimensions. He does not fill the immensity of space, and cannot be everywhere present in person at the same time. He is also called the Holy Spirit, the Spirit of God, the Spirit of the Lord, the Spirit of Truth, and the Comforter” (Joseph Fielding Smith, Doctrines of Salvation, 1:38).
“The Holy Ghost as a personage of Spirit can no more be omnipresent in person than can the Father or the Son, but by his intelligence, his knowledge, his power and influence, over and through the laws of nature, he is and can be omnipresent throughout all the works of God” (Joseph F. Smith, Gospel Doctrine, 61).