From this, we see that Elijah's mission was to restore that priesthood which would turn the hearts of the children to their fathers, according to a promise that had been made to the fathers. That it was extremely important and necessary, is shown in the fact that the whole earth would be utterly wasted at the coming of the great and dreadful day of the Lord, if this priesthood were not restored. This quotation deeply impressed the prophet at that time, although he could not understand it. Three times that night it was repeated, and again on the following day. Gradually, as link after link of the gospel chain was revealed, and the keys and powers were bestowed, the prophet increased in wisdom and knowledge. In time, a temple was built in Kirtland, but in it there was no baptismal font, or any other provision made for ordinance work for the dead. The reason is that the doctrine had not been fully revealed. This temple, however, served the purpose for which it was erected, a house of the Lord, where he could come, and send his angels to bestow keys and authority necessary in this dispensation. In this temple, April 3, 1836, the Savior and many of the ancient prophets appeared to Joseph Smith and Oliver Cowdery and bestowed upon their heads the keys of the several dispensations. Among these heavenly visitors came Elijah, who placed his hands on the heads of Joseph Smith and Oliver Cowdery, and gave them the priesthood spoken of by Malachi. "Therefore," said he, "the keys of this dispensation are committed into your hands, and by this ye may know that the great and dreadful day of the Lord is near, even at the doors."[F] [Footnote F: Doc. & Cov. 110:16.] What was the promise made to the fathers that was to be fulfilled in the latter-days by the turning of the hearts of the children to their fathers? It was the promise of the Lord made through Enoch, Isaiah, and the prophets, to the nations of the earth, that the time should come when the dead should be redeemed. And the turning of the hearts of the children is fulfilled in the performing of the vicarious temple work and in the preparation of their genealogies. Up to the time of Elijah's visit, there had been nothing done for the dead. The doctrine was not understood by the Saints, and there was no temple built where the ordinances could be performed. But as soon as this priesthood was restored, the hearts of the children commenced turning toward their fathers.