What do you learn in the exposition about hale? what qualifies him to discern witchcraft?

John Hale is a reverend who is called by Parris in order to examine his daughter Betty. We learn that Hale is an intelelctual, and an eager one at that. He projects an air of great knowledge, and feels very proud of it.

Hale is an especialist in witchcraft. However, we learn that his skills have not been used often. The errand made him extremely excited because he considered himself a specialist on a subject through constant studying, and his services were finally needed. He eventually realizes that he was mistaken in his conclusions, but it is too late.

the answer is:  

he is voicing feelings shared by all humans regardless of race.

in paul laurence dunbar's poem "we wear the mask," he replicates the words mask and we to emphasize how people in general -not just black americans- hide their true feelings. he suggests the masks cover people's faces and eyes, which are the main parts that display their emotions. he also thinks people's pain conceal behind those masks, so that they cannot see reality and nobody is able to see one another's sorrow.