The Right of Presidency in Spiritual Things

Doctrine and Covenants 107:8–12

8 The Melchizedek Priesthood holds the right of presidency, and has power and authority over all the offices in the church in all ages of the world, to administer in spiritual things.
9 The Presidency of the High Priesthood, after the order of Melchizedek, have a right to officiate in all the offices in the church.
10 High priests after the order of the Melchizedek Priesthood have a right to officiate in their own standing, under the direction of the presidency, in administering spiritual things, and also in the office of an elder, priest (of the Levitical order), teacher, deacon, and member.
11 An elder has a right to officiate in his stead when the high priest is not present.
12 The high priest and elder are to administer in spiritual things, agreeable to the covenants and commandments of the church; and they have a right to officiate in all these offices of the church when there are no higher authorities present.

President Harold B. Lee said:

“What is priesthood? Well, we’ve had the definition—it’s the power of the Lord given to man to act for Him in things pertaining to salvation. But I have a different definition that to me seems more accurate. Priesthood is the power by which the power of the Almighty works through man. . . . The priesthood is the center, the core, the power by which all the activities of the Church are to be directed.”

(The Teachings of Harold B. Lee, ed. Clyde J. Williams [1996], 481–82.)