1. Abraham learns that in the premortal life many spirits were foreordained to their mortal missions.

Abraham 3:23 These will I make my rulers

‘Remember, in the world before we came here, faithful women were given certain assignments while faithful men were foreordained to certain priesthood tasks. While we do not now remember the particulars, this does not alter the glorious reality of what we once agreed to.’ (Teachings of Spencer W. Kimball, p. 316)

‘Every man who has a calling to minister to the inhabitants of the world was ordained to that very purpose in the Grand Council in heaven before this world was. I suppose that I was ordained to this very office in that Grand Council.’ (Teachings of the Prophet Joseph Smith, p. 365)

‘Just as certain men were foreordained from before the foundations of the world, so were certain women appointed to certain tasks. Divine design—not chance—brought Mary forward to be the mother of Jesus. The boy prophet, Joseph Smith, was blessed not only with a great father but also with a superb mother, Lucy Mack, who influenced a whole dispensation.’ (Neal A Maxwell, “The Women of God,” Ensign, May 1978, p.10)

“During the ages in which we dwelt in the pre-mortal state we not only developed our various characteristics and showed our worthiness and ability, or the lack of it, but we were also where such progress could be observed. It is reasonable to believe that there was a Church organization there. The heavenly beings were living in a perfectly arranged society. Every person knew his place. Priesthood, without any question, had been conferred and the leaders were chosen to officiate. Ordinances pertaining to that pre-existence were required and the love of God prevailed. Under such conditions it was natural for our Father to discern and choose those who were most worthy and evaluate the talents of each individual. He knew not only what each of us could do, but also what each of us would do when put to the test and when responsibility was given us. Then, when the time came for our habitation on mortal earth, all things were prepared and the servants of the Lord chosen and ordained to their respective missions” (Joseph Fielding Smith,  The Way to Perfection [1970], 50–51 ).

2. Jesus Christ was chosen in the Council in Heaven to be our Savior; we chose to follow him. Lucifer (Satan) and the spirits who followed him were cast out of heaven.

The first step in salvation of man is the laws of eternal and self-existent principles.  Spirits are eternal.  At the first organization in heaven we were all present, and saw the Savior chosen and appointed and the plan of salvation made, and we sanctioned it. (Teachings of the Prophet Joseph Smith, p.181)

Abraham 3:27 Here am I, send me

‘Jesus Christ, our great Exemplar, gave His life to His Father’s work. In the Grand Council before this world was organized, Jesus, chosen and anointed from the beginning, volunteered, “Here am I, send me.”  ^{Abraham 3:27} In so doing, He literally became the servant of us all. Through Jesus Christ and the power we receive through His Atonement, we can also serve. He will help us.’ (Carl B Cook, General Conference, October 2016)

Moses 4:1-2 Satan

‘In the premortal existence, Satan was called “Lucifer,” which means “the Shining One” or “Lightbringer.” He was a “son of the morning” (see Isaiah 14:12; D&C 76:25–27) and had potential to do much good. But Lucifer sought to obtain the throne, honor, power, and glory of Heavenly Father (see D&C 29:36; 76:28; Moses 4:1). To do so, he proposed to “redeem all mankind, that one soul shall not be lost” (Moses 4:1). However, his proposal was based on compulsion and would therefore eliminate the agency of Heavenly Father’s children and the need for a Savior to suffer and redeem them.’ (Institute Pearl of Great Price Student Manual)

Abraham 3:26 First estate

“Abraham was shown the eternal nature of the plan of salvation and was taught that the earth was purposely created as a schooling and testing ground in ‘all things’ (Abr. 3:25), and learned that rich and everlasting rewards (“glory added upon their heads for ever and ever”) are reserved for those who remain faithful to the plan of the Father (Abr. 3:26). It is on this point that Abraham’s record makes another singular contribution to our understanding of premortality, clarifying what otherwise would be an obscure phrase found elsewhere in one verse of the New Testament. Only Abraham and Jude speak of our premortal condition as the ‘first estate’ (Jude 1:6, Abr. 3:26).

“In that one verse, Jude speaks of certain angels not keeping their ‘first estate’ and thus leaving ‘their own habitation.’ But only from Abraham do we learn that these angels were in fact spirit children in the presence of God, that the habitation they left was God’s presence, that they departed because they chose to follow Satan rather than God and Jesus Christ, and that in this ‘first estate’ God’s children lived as independent identities, exercising moral agency in the Father’s presence. Were it not for the book of Abraham, much of our basic understanding of the structure, sociality, and history of our premortal existence would be missing. Only Abraham’s remarkable record speaks of mortality’s probationary period as the ‘second estate,’ given as an endowment to all those who kept their first estate (Abr. 3:26).” (“The Book of Abraham: A Most Remarkable Book,” Ensign, Mar. 1997, 21)

Abraham 3:28 many followed after him

‘When the great council was held in heaven, in which all of us were involved, the Father presented his plan for peopling the earth, and for the salvation of man. Lucifer wanted to amend the plan. He proposed to destroy the agency of man and to save all mankind, that not one soul would be lost. This he would accomplish through outright force and coercion, denying all persons the right of choice.

Satan’s proposal of compulsion was rejected by the Father, and Lucifer “was angry, and kept not his first estate; and, … many followed after him.”  Abr. 3:28

We must have witnessed that tragic scene when Lucifer—brilliant, capable, yet lacking in intelligence to properly apply his knowledge (along with one-third of the hosts of heaven)—rose in hateful rebellion against God. And they were expelled from heaven, retaining the malignant powers to tempt and to persuade men to disobey God.’ (Elray L Christansen, General Conference, October 1974)

Moses 4:4 to deceive and to blind men

President Brigham Young said: “Every person who desires and strives to be a Saint is closely watched by fallen spirits that came here when Lucifur [sic] fell, and by the spirits of wicked persons who have been here in tabernacles and departed from them. … Those spirits are never idle; they are watching every person who wishes to do right, and are continually prompting them to do wrong” (in Journal of Discourses, 7:239).