There WIll Be Times When All That Stands as A Shield Between Your Family and The Adversary's Mischief Will Be [the Priesthood Power].

Now, fathers, I would remind you of the sacred nature of your calling. You have the power of the priesthood directly from the Lord to protect your home. There will be times when all that stands as a shield between your family and the adversary’s mischief will be that power. You will receive direction from the Lord by way of the gift of the Holy Ghost.

Boyd K. Packer, "The Power of the Priesthood", Ensign, May 2010, 6–10