What do we learn about Hale and what qualifies him to discern witchcraft?

Hale is an expert on witchcraft having tried and convicted several women in his own parish.
Hale does not believe in witchcraft and uses his status as a Reverend to help people think logically.
Hale is excited about persecuting witches and considers himself an expert.
Hale believes God speaks directly to him and gives him special sight to discern the Devil.