In response to the prayers of the Twelve, Christ immediately finds a place to pray to the Father on their behalf. In the first of three prayers uttered on behalf of the Twelve, primarily, the Savior demonstrates his role as the Mediator. If theTwelve are praying to him, then he will pray to the Father for them. As Paul stated, For there is…one mediator between God and men, the man Christ Jesus (1 Tim 2:5).
On behalf of the righteous disciples, he thanked the Father for giving them the Holy Ghost which came because of their faith, and he prayed that they might be one. Such is the prayer of the Mediator for the righteous. For the repentant sinner, the Lord may plead somewhat differently:
'Listen to him who is the advocate with the Father, who is pleading your cause before him—
Saying: Father, behold the sufferings and death of him who did no sin, in whom thou wast well pleased; behold the blood of thy Son which was shed, the blood of him whom thou gavest that thyself might be glorified;
Wherefore, Father, spare these my brethren that believe on my name, that they may come unto me and have everlasting life.' (DC 45:3-5)
How do we receive this great privilege? To have the Lord plead our case before the Father? In both instances, the secret was the simple concept of faith in Jesus Christ. Those who believe in his name will be privileged to hear him plead their case before the Father, that the blood he spilt in righteousness may spare those whose righteousness has fallen short.
Joseph Smith
"The saints have a sure foundation laid for the exercise of faith unto life and salvation, through the atonement and mediation of Jesus Christ; by whose blood they have a forgiveness of sins, and also a sure reward laid up for them in heaven, even that of partaking of the fullness of the Father and the Son through the Spirit. As the Son partakes of the fullness of the Father through the Spirit, so the saints are, by the same Spirit, to be partakers of the same fullness, to enjoy the same glory; for as the Father and the Son are one, so, in like manner, the saints are to be one in them. Through the love of the Father, the mediation of Jesus Christ, and the gift of the Holy Spirit, they are to be heirs of God, and joint heirs with Jesus Christ." (Lectures on Faith, p. 49)