1 Nephi 19:2
He Knoweth All Things
2 And I knew not at the time when I made them that I should be commanded of the Lord to make these plates; wherefore, the record of my father, and the genealogy of his fathers, and the more part of all our proceedings in the wilderness are engraven upon those first plates of which I have spoken; wherefore, the things which transpired before I made these plates are, of a truth, more particularly made mention upon the first plates.
1- Nephi has been commanded to make a second set of plates
2-He didn't know prior to this time that he would be making a second set
3-On the first set he recorded the record of Lehi, his genealogy and the journey in the wilderness.
4-Nephi testifies that these records are true.
One record was for secular things (the first one)
One record was for sacred things (the second one)
both records were sacred though because he didn't write anything except he thought it would be sacred and important enough to be recorded in this difficult manner.
In the latter days part of the translation was stolen. Because Nephi had made a second record, Joseph Smith could use it and the evil men who had stolen it could not dispute the record.
Having Faith in God and His Purposes (Scripture Analysis, Discussion)
Jesus was ordained to come to earth and to save all who would accept him from their sins.
“Now the Lord had shown unto me, Abraham, the intelligences that were organized before the world was; and among all these there were many of the noble and great ones;
“And God … said: These I will make my rulers; … and he said unto me: Abraham, thou art one of them; thou wast chosen before thou wast born.” (Abr. 3:22–23.)
The Book of Abraham, in corroborating section 93, used words whose full measure you and I have scarcely begun to take: “if there be two spirits, … notwithstanding one is more intelligent than the other, [they] have no beginning; they existed before, they shall have no end … for they are … eternal.” (Abr. 3:18.)
May we so believe, so trust, so submit, and so behave, I pray in the name of Him who is the “Lord of the narrow gate and the needle’s eye” (C. S. Lewis, At the Breakfast Table, p. xxv), even Jesus Christ, amen.
301-I Am A Child Of God
4-I Lived In Heaven
D&C 138 56 Even before they were born, they, with many others, received their first lessons in the world of spirits and were prepared to come forth in the due time of the Lord to labor in his vineyard for the salvation of the souls of men.