Avon and Somerset police are trying to trace the whereabouts of Christopher Agar, who has gone missing from Bath.
The 34-year-old was last seen on the evening of Friday, April 4 and is described as a white male, 5’ 10” tall stocky build long fair unkempt hair.
He habitually wears navy jogging bottoms and a grey anorak type jacket.
A police spokesman said: "It is believed that Mr Agar left Bath by train and may be in the Devon and Cornwall area Mr Agar has a history of schizophrenia and depression and has been described by relatives as being very low at the present time.
"When he is feeling low he tends to starts preaching about religious issues to members of the public usually in town centres."