Imam Sadiq (PBUH) said: Jesus the son of Mary said: I gave medicine to the sick and cured them by God's will. I gave sight to the blind and healed the leper by God's will. I tended to the dead and gave them life by God's will. I tended to the fool but I was unable to correct him. Jesus was then asked: Oh spirit of God! Who is a fool? Jesus replied: One who is enamoured with himself and his own ideas, who sees only himself in possession of every virtue, and who considers only himself as right and no one else. Such a person as this is a fool to whose cure there is no road.