Faithfully Obtaining the Aaronic and Melchizedek Priesthoods

Doctrine and Covenants 84:33

33 For whoso is faithful unto the obtaining these two priesthoods of which I have spoken, and the magnifying their calling, are sanctified by the Spirit unto the renewing of their bodies.

President Joseph Fielding Smith said: 

“There is no exaltation in the kingdom of God without the fulness of the priesthood, and every man who receives the Melchizedek Priesthood does so with an oath and a covenant that he shall be exalted.”

(In Conference Report, Apr. 1970, 58.)