In the following excerpt from the LDS temple ceremony, Lucifer claims that God the Father “gained his knowledge” after eating of the tree of the fruit of good and evil and having his eyes opened; presumably during his mortal life on another world.
LUCIFER: “Eve, here is some of the fruit of that tree. It will make you wise. It is delicious to the taste and very desirable.”
EVE: “Who are you?”
LUCIFER: “I am your brother.”
EVE: “You, my brother, and come here to persuade me to disobey Father?”
LUCIFER: “I have said nothing about Father. I want you to eat of the fruit of the Tree of Knowledge of Good and Evil, that your eyes may be opened, for that is the way Father gained his knowledge. You must eat of this fruit so as to comprehend that everything has its opposite: good and evil, virtue and vice, light and darkness, health and sickness, pleasure and pain – thus your eyes will be opened and you will have knowledge.”
EVE: “Is there no other way?”
LUCIFER: “There is no other way.”
Is it possible that an all knowing being, who has been forever, had to gain knowledge?