Premortal choices affect mortal life.
1. "Throughout your premortal life, you developed your identity and increased your spiritual capabilities. Blessed with the gift of agency, you made important decisions, such as the decision to follow Heavenly Fatherís plan. These decisions affected your life then and now." ("Plan of Salvation," True to the Faith, p.116.)
2. "Foreordination: Callings given by Heavenly Father to his children to come to earth at a specific time and place to help with his work in a particular way." (Gospel Principles, Glossary,"Foreordination," pp. 378-379.)
3. "In the premortal spirit world, God appointed certain spirits to fulfill specific missions during their mortal lives. This is called foreordination....
"The doctrine of foreordination applies to all members of the Church, not just to the Savior and His prophets. Before the creation of the earth, faithful women were given certain responsibilities and faithful men were foreordained to certain priesthood duties." ("Foreordination," True to the Faith, pp.69-70.)
4. "Even though we have forgotten, our Father in Heaven remembers who we were and what we did before we came here.... He has chosen the time and place for each of us to be born so we can learn the lessons we personally need and do the most good with our individual talents and personalities." (Gospel Principles, "Our Heavenly Family," p.33.)
5. "All these rewards were seemingly promised, or foreordained, before the world was. Surely these matters must have been determined by the kind of lives we had lived in that premortal spirit world. Some may question these assumptions, but at the same time they will accept without any question the belief that each one of us will be judged when we leave this earth according to his or her deeds during our lives here in mortality. Isnít it just as reasonable to believe that what we have received here in this earth life was given to each of us according to the merits of our conduct before we came here?" (Harold B. Lee, as quoted in "Doctrines of the Gospel" (Student Manual, Religion 430 and 431, 2004, p.56.)