People react to Jesus in different ways in Matthew's Gospel. We read of them being jealous. People are often amazed or surprised by things Jesus says and does. In this passage, Matthew shows us that people are afraid of Jesus. This is important to remember for those who would follow Jesus. He is the savior. He offers that we can be his friends. Still, he is also always our master and the one coming to judge us in the end.
Peter failed miserably when it came time to maintain his confession of Jesus Christ. A little social pressure in the courtyard of the high priest, and Peter opted to save his own skin by denying any knowledge of Jesus. In his failure, though, all disciples of Jesus can learn a powerful lesson about "godly sorrow," and the grace of guilt leading to repentance. There is always hope in Jesus Christ.