Brazilian spirit doctor ‘John of God’ believes he has a mission that he was given when he was nine years old and has been healing people without the use of anesthetics or even disinfectants.

Wednesday’s episode of the Oprah Winfrey Show will be about spirit doctors and will have a number of shots from a documentary made about John.

Can ‘John of God’ really heal people or is it the power of the belief in his followers that enables them to heal themselves? Do spirits operate through him or can people really change their mind enough to heal their bodies?

Either way, does it really matter?