D&C 84

With the oath and covenant of the priesthood, the Lord promised that -

"...he that receiveth my Father receiveth my Father's kingdom; therefore all that my Father hath shall be given unto him."  (Doctrine and Covenants  Section 84:38)

Paul taught -

"The Spirit itself beareth witness with our spirit, that we are the children of God:
17 And if children, then heirs; heirs of God, and joint-heirs with Christ; if so be that we suffer with him, that we may be also glorified together."  (New Testament  Romans 8:16 - 17)

George Q. Cannon said 100 years ago -

"The Latter-day Saints are promised, if they are faithful, that they shall receive the fullness, as Jesus received it; and Jesus received it as the Father received it. In the words of Paul, they become heirs of God and joint heirs with Jesus Christ. There is nothing that the Savior has attained unto that God's faithful children are not promised. They are promised the same blessings, the same power, the same authority, the same gifts, the same graces. I know that we are apt to think that heaven is a sort of spiritual place. It is spiritual; but God our Eternal Father is a being of power. He controls the earth and the inhabitants thereof; He controls the elements of the earth; and we are promised that we shall be sharers with Him. He will give us an equal interest in all this power and authority. . . .

The promise is that all things that He hath shall be given unto us. We will be His heirs; we will be (if I may use the term without irreverence) co-partners with Him in all this power and authority. I do not know whether all the Latter-day Saints grasp this idea. It is important that we should." (George Q. Cannon, CR, April 1899, p. 65.)