Jesus most times commanded those he performed miracles on not to tell anyone because he didn't want the people to come to him because of the miracles that he's wrought, he want them to come to him because they believe that he is the son of God that has come to take away their sins. If you look at the church of today, you'll discover that most people are acknowledging God because of what they want him to do for them, not because of who he is. This is what Jesus Christ was trying to avoid them.