This is a most difficult passage. It sounds as though the Lord is stating that he will come into the world to fulfill two wills- the will of Jehovah, the premortal God of the ancients (perhaps referred to here as “me’), and the will of the mortal Messiah (the person of ”flesh“). Of course we know that they, Jehovah and Jesus, are one and the same being.
At the same time, this statement dramatizes the separate and severable roles that would be played by the Master, that of the Holy One of Israel (premortal) and that of Jesus of Nazareth (mortal).
There is a sense, then, in which we might speak of the Lord Jehovah, acting always under the direction of Elohim, our Heavenly Father, as the one who sent Jesus Christ into the world. Note the following language from the Psalmist: ”The Lord [Jehovah] said unto my Lord [Jesus], Sit thou at my right hand, until I make thine enemies thy footstool“ (Psalms 110:1; compare Matthew 22:41-45).
A similar pattern emerges in the greatest of all messianic prophecies. In speaking of the suffering Savior, Isaiah wrote that ”the Lord [Jehovah] hath laid on him [Jesus] the iniquity of us all.“ Further,”it pleased the Lord [Jehovah] to bruise him [Jesus]; he [Jehovah] hath put him [Jesus] to grief.’ (Isaiah 53:6, 10; Mosiah 14:6, 10.)
In the same vein the Lord Jehovah spoke to the brother of Jared:
“And whatsoever thing persuadeth men to do good is of me; for good cometh of none save it be of me. I am the same that leadeth men to all good; he that will not believe my words will not believe me- that I am; and he that will not believe me will not believe the Father who sent me. For behold, I am the Father, I am the light and the life, and the truth of the world”
(Ether 4:12, italics added).