The fullness of truth, and the fulness of the Holy Ghost, and the fulness of the priesthood, and the fulness of the glory of the Father are all phrases that are ocurrent in connection with the temple, and cannot be received anywhere else, nowhere else on the planet. You cannot receive the fulness that the Lord has for you without coming through the temple and having the temple come through you.

Source: Foundations of Temple Worship, BYU-Idaho Devotional Address, October 2004