Simply put, Jesus can't just be a teacher because of his claim to be the Son of God, something that sets him apart in history. All of his moral teachings come back to this. Whereas, 'most Religious leaders point away from themselves and to God, as we would expect... Jesus, the most humble and self-effacing person who ever lived, in pointing people to God, pointed to himself' (Nicky Gumbel, Questions of Meaning). He made some big claims, all based on himself. He said he was 'the Way, the Truth and the Life,' and said that, 'no one can come to the Father except through me' (John 14:6). The identity of Jesus is a polarising question, and if he is who he says he is, as Christians believe, then it changes everything.
'his fame spread throughout Syria,
and those who were suffering from diseases and painful complaints of one kind or another, the possessed, epileptics, the paralysed,
were all brought to him,
and he cured them all.'
Of all historical figures, Jesus of Nazareth, the son of a carpenter, has arguably had the greatest impact upon the way in which we live today. His moral teachings are upheld by many, among non-Christians as well as Christians. In the twenty first century however, there is a growing sentiment that Jesus was just another great moral teacher, a really 'nice guy', but history would challenge us to look for more.
Histories beyond the Gospels refer to Jesus as 'a doer of wonderful works', and a large part of his ministry was seeming to be able to do the impossible. healing lifelong illnesses among other miraculous feats. Matthew's gospel describes this phenomenon, saying:
'Yes I am a king. I was born for this, I came into the world for this: to bear witness to the truth; and all who are on the side of truth listen to my voice.' John 18:37
Who is Jesus?
'A man who was merely a man and said the sort of things Jesus said would not be a great moral teacher. He would either be a lunatic - on the level with the man who says he is a poached egg - or else he would be the Devil of Hell. You must make your choice. Either this man was, and is the Son of God, or else a madman or something worse... but let us not come with an patronising nonsense about his being a great human teacher. He has not left that open to us. He did not intend to.' C.S. Lewis, Mere Christianity
Reasoning would tell us still more about him. As C.S. Lewis famously argued: