Teaching Authority

What does it mean in Mark 1:21-28 that Jesus taught them as one who had authority? He did not teach like the Pharisees, yet they were the religious authorities of the day. They were known for nit-picky preaching. So, if religious authority does not make someone an authority to teach, what does? Let’s first of all look at the other extreme, those who teach as if they have authority, but their teaching is rubbish. Any ignorant fool can stand up and act like he knows it all, pulling ideas out of thin air and blaming the Holy Spirit for idiotic doctrines, but that is not what this is talking about either. To have the authority of Jesus, we ought to at least start by teaching what Jesus taught instead of inventing things that have no basis in the Bible.