Paul B. Pieper said that the fullness of the priesthood is found in the marriage relationship.
Paul B. Pieper, "The Realities of Mortality," BYU-I Speeches, February 19, 2013, accessed December 5, 2022
Eternal marriage and all that it is designed to help us learn and experience are the key to obtaining all of the blessings that the Father wants to give His children. Only a family—a man and a woman who live worthy to enter the house of the Lord and are sealed to each other—can be eligible. The full blessings of the priesthood are received together, as husband and wife, or not at all.
It is interesting that in the oath and covenant of the priesthood, the Lord uses the verbs obtain and receive. He does not use the verb ordain. It is in the temple that men and women—together—obtain and receive the blessings and power of both the Aaronic and Melchizedek Priesthoods. Having received these blessings in the house of the Lord, it is principally in their home life where they develop godly characteristics and attributes—sacrificing for and serving each other, loving each other with full fidelity, and being united in their love for each other and God.