1 Jesus stepped into a boat, crossed over and came to his own town. 2 Some men brought to him a paralyzed man, lying on a mat. When Jesus saw their faith, he said to the man, “Take heart, son; your sins are forgiven.”
3 At this, some of the teachers of the law said to themselves, “This fellow is blaspheming!”
4 Knowing their thoughts, Jesus said, “Why do you entertain evil thoughts in your hearts? 5 Which is easier: to say, ‘Your sins are forgiven,’ or to say, ‘Get up and walk’? 6 But I want you to know that the Son of Man has authority on earth to forgive sins.” So he said to the paralyzed man, “Get up, take your mat and go home.” 7 Then the man got up and went home. 8 When the crowd saw this, they were filled with awe; and they praised God, who had given such authority to man.
The Calling of Matthew
9 As Jesus went on from there, he saw a man named Matthew sitting at the tax collector’s booth. “Follow me,” he told him, and Matthew got up and followed him.
10 While Jesus was having dinner at Matthew’s house, many tax collectors and sinners came and ate with him and his disciples. 11 When the Pharisees saw this, they asked his disciples, “Why does your teacher eat with tax collectors and sinners?”
12 On hearing this, Jesus said, “It is not the healthy who need a doctor, but the sick. 13 But go and learn what this means: ‘I desire mercy, not sacrifice.’[a] For I have not come to call the righteous, but sinners.”
Alright. First story.
Some guys bring their paralyzed friend to Jesus so that Jesus will heal them. Jesus response?
Jesus totally trolled them. So the friends are all,
And the teachers of the law were all,
So then Jesus rhetorically asks, which is easier, to say to a man that his sins are forgiven, or to straight up heal him. Then Jesus straight up healed the guy. He did it so that people would know that he was God because only God has the authority to forgive sins and the power to heal. If Jesus was just saying the words “Your sins are forgiven,” without Gods authority to do so, there’s no way God would have given Jesus the power to heal the guy. The response?
Now, the second story. Jesus was doing his thing, calling disciples, when he found Matthew. Matthew was a tax collector, an old Hebrew phrase meaning “douchebag that everyone hates cause he takes our money and gives it to those Roman jerks who are oppressing our people.” Jesus walked up to him and said, “Follow me.” Why did Matthew drop everything and go with Jesus? Well, it was a big deal for a rabbi (teacher) to ask you to follow him. It would be like if you were just walking around and a samurai walked up to you and said, “Hey, I want to teach you to wield a sword. Come with me.” Only instead of it being a person like you being asked to be an apprentice to this man forged from pure awesome, it’s that douchebag that no one likes. So yeah. Big deal.
So Jesus goes to Matthew’s house to eat with him, which was another big deal because it meant Jesus was publicly associating himself with a tax collector. Some Pharisees (which is an old Hebrew word for Guys who are better than you will ever even imagine being. And that isn’t being sarcastic. In their day, these guys were the guys who followed the Law of God. They did what was right all the time, and they did it in ways you wouldn’t even understand.) come along and they ask the guys who are learning from Jesus, why Jesus is hanging out with terrible jerks like that (Just so we’re clear, this would be like Mother Teresa inviting a bunch of drug dealers over to play some Xbox. It’s understandable that the Pharisees would be confused. Though it is more likely they were attempting to troll Jesus’ disciples).
Jesus overhears the conversation and comes to explain. He says, “It is not the healthy who need a doctor, but the sick,” he says meaning that it would do no good to go and chill with a bunch of righteous people all the time, just talking about how awesome they all are, and never try to help the evil people. Then he busts out, “But go and learn what this means: ‘I desire mercy, not sacrifice.’” He was quoting the old testament, a book which the Pharisees would have had memorized. It would be kind of like like quoting Einstein to school some theoretical physicists. As the final shot Jesus says, “For I have not come to call the righteous, but sinners.” 
