Twice in the reading today Jesus does something that only God does.
In chapter 2, He forgives a man's sin. Those around Him state the obvious: "Who does this guy think he is? Only God can forgive a man's sin." I have to think that Jesus kind of raised an eyebrow and smirked a bit, thinking something like: "You're closer to the Kingdom than you thought." He then heals the guy to prove that He has the authority to forgive sin.
In chapter 4, Jesus takes a nap on a boat in the storm. He must have been some sort of tired. When the disciples freak out, He wakes up, speaks to the storm, and the winds and waves cease. The disciples, standing there slack-jawed and gaga-eyed, ask, "Who is this that even the winds and waves obey Him?" Well, the rule is that if you're the Creator, then you are the Commander. Only God can command the winds and waves.
And for all who follow Jesus, that's the biggest deal. We're not saying Jesus is a good teacher (though He is). We're not saying that Jesus is an example to emulate (though He is). We're not saying Jesus does a great job in the area of ethics (though He does).
We're saying Jesus is God. Fully divine. Fully human. And fully our Savior.