The Holy Bible, Revelation 14:6-7

6 And I saw another angel fly in the midst of heaven, having the everlasting gospel to preach unto them that dwell on the earth, and to every nation, and kindred, and tongue, and people,

7 Saying with a loud voice, Fear God, and give glory to him; for the hour of his judgment is come: and worship him that made heaven, and earth, and the sea, and the fountains of waters.

Conference Report, Joseph F. Smith, October 1931

The ancient prophets looked forward to this dispensation for they knew it was to be the time of the restoration of all things both which are in heaven and which are on earth. This restoration was to come through the sending of the Gospel from heaven with the fulness of the priesthood, and all things were eventually to be set in order according to the will of the Lord.