We all had a teacher in our classroom. On the first day they would go over what the rules of their classroom were, how we were supposed to behave, what would make us good students, etc. Throughout the year they taught, instructed, supervised and helped us to become the best students we could be! Sometimes we listened to the teacher and other times we didn't.
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This is exactly how it was and has always been when God has called a prophet as well! A prophets role is primarily to testify and teach of Christ. They also instruct us on matters that are necessary for our salvation, they prophecy of things to come, they interpret scripture and most of all lead us on the path of righteousness! Like a teacher in a classroom, the prophet provides the way for us to be successful in our lives. The way to find happiness and eventually return home to our Heavenly Father. We can either choose to accept and follow his direction and counsel or choose to disregard it. It's up to us.