Elder D. Todd Christofferson - The Sealing Power

 Elder Christofferson taught (which was one of my more favorite conference talks) -

"...Elijah, and it is the authority and keys he restored that I want to speak about today.11 The power to validate all priesthood ordinances and make them binding both on earth and in heaven—the sealing power—is crucial for gathering and preparing a covenant people on both sides of the veil."

"“I will reveal unto you the Priesthood, by the hand of Elijah the prophet.”12 Joseph Smith later explained: “Why send Elijah? Because he holds the keys of the authority to administer in all the ordinances of the Priesthood; and [unless] the authority is given, the ordinances could not be administered in righteousness”13—that is, the ordinances would not be valid in both time and eternity."

"In a teaching now canonized as scripture in the Doctrine and Covenants, the Prophet stated: “It may seem to some to be a very bold doctrine that we talk of—a power which records or binds on earth and binds in heaven. Nevertheless, in all ages of the world, whenever the Lord has given a dispensation of the priesthood to any man by actual revelation, or any set of men, this power has always been given. Hence, whatsoever those men did in authority, in the name of the Lord, and did it truly and faithfully, and kept a proper and faithful record of the same, it became a law on earth and in heaven, and could not be annulled, according to the decrees of the great Jehovah.”"

"We tend to think of the sealing authority as applying only to certain temple ordinances, but that authority is necessary to make any ordinance valid and binding beyond death.16 The sealing power confers a seal of legitimacy upon your baptism, for example, so that it is recognized here and in heaven. Ultimately, all priesthood ordinances are performed under the keys of the President of the Church, and as President Joseph Fielding Smith explained, “He [the President of the Church] has given us authority, he has put the sealing power in our priesthood, because he holds those keys.”"

Which suggests to me that any ordinance, covenant or blessing performed and authorized under priesthood keys (through the prophet who holds all keys), becomes valid on and earth and in heaven.  All depending on faithfulness.