A failure to learn about Satan's plan for man here on earth would be fatal to the full exercise of free agency. The reason for this lies in the fact that . . . free agency is the opportunity to choose between good and evil. To intelligently make such a choice one must understand the alternatives-both of them. To the extent one is ignorant of these alternatives, to that same extent he has not made a complete choice. Until a person understands Satan's plan, he can never be certain he does not believe in it and is not helping to carry it out.