In the entirety of the Sermon on the Mount (Matthew 5-7) Jesus is presented as a master teacher, because He teaches with authority. He has a grasp of the Scriptures, dares to make their commands even more prohibitive, and doesn’t quote other teachers to make His points. He is different than the other teachers of the law!
And what does He teach? He teaches that if we hear and obey we’ll examine ourselves before we judge others. He teaches that if we hear and obey we’ll depend upon God for what we need, and understand how much He loves us. He teaches that if we hear and obey we’ll understand that there is only one way to God, and the path that leads to Him makes demands on us. He teaches that if we hear and obey we’ll know who the false teachers are, and we’ll realize the judgment that they’ll face one day.