Matthew and Luke's Modifications
The authors of the Gospel According to Matthew, and the Gospel According to Luke made some considerable modifications, deletions, and additions to the Gospel of Mark. To the average reader the changes seem rather significant and one might ask why these changes were made. Well, there are several reasons why these changes were made. For example, the authors wanted to show readers that Jesus was more holy than the original author set him out to be. Also, the authors sought after to express the gospel in, what they thought, were better words to make it appear more authentic. Furthermore the authors of the Gospel According to Matthew and the Gospel According to Luke wanted simply to modify the text because they didn't see eye to eye with what the original author said.
Beginning with the author of Matthew we can see in the verse of Mark 3.22. It states, "And the scribes who came down from Jerusalem said, ?He is possessed by Be-el'zebul, and by the prince of demons he casts out the demons.'" However it is stated in Matthew 12.24 "But when the Pharisees heard it they said, ?it is only by Be-el'zebul, the prince of demons, that this man casts out demons.'" The author made this change to specifically show that it was the Pharisees, not the scribes, who thought that Jesus was possessed by the devil. Although, eventually many people believed that Jesus was possessed, I believe that the author modified the text to show that the Pharisees were the ones who originally stated this.
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An example of the author portraying Jesus as more holy, or God like, occurs in Matthew 17.22. It says, "As they were gathering in G ...