Same as with any source of authority. There is no authority that is inerrant – government, teachers, professors, police, managers, doctors, politicians, preachers, or even the pope. Though authorities have weight in what they say, not everything they say will be correct. But, that doesn’t mean everything they say is incorrect. So, we need to put on our thinking caps and do some research to find out the truth. It’s similar with the Bible. We need to dig a bit deeper and discern what is the truth.