There was a bible teacher from another country telling about how for several days his class was always tired and some falling to sleep during his teaching.

          So one day after class, he started looking around the classroom and discovered a bronze statue of a cobra near a window. It was a coiled cobra that many in that country worshipped as a god.

                 He took it outside and later spent some time praying and praising as usual getting ready for his class the next day. He didn't say anything about what he had found or done with the statue.

                          The next morning, not one single student became drowsy or fell asleep.