What kind of man is Reverend Hale when he first arrives in Salem? to what extent is he a changed man in Act four?

When he gets to Salem for the first time, Rev. Hale is
sort of an arrogant man.  He has a lot of learning and he thinks he knows how to find
evidence of Satan's influence in the community.  He shows this by grilling the Proctors
about stuff like how often they go to church and whether they know the
Commandments.

By the time Act IV comes around, he has
gotten a lot more humble.  He no longer thinks that he knows everything.  Instead, he
thinks that the court has gone to far and needs to pull back.