When Reverend Hale first arrives in Salem, he is very confident in his education and ability to root out evil. When Reverend Parris comments on the heaviness of Hale's books, Hale says, "They must be; they are weighted with authority." He arrives with all his books and knowledge and believes that there is no way the Devil could hide from him. Further, when Parris insists that his daughter's inability to listen to the Lord's name is a clear sign of witchcraft, Hale replies,
No, no. Now let me instruct you. We cannot look to superstition in this. The Devil is precise; the marks of his presence are definite as stone, and I must tell you all that I shall not proceed unless you are prepared to believe me if I should find no bruise of hell upon her.
Again, Reverend Hale clearly sees himself as an expert in matters of witchcraft, even more so than another minister, and he explains that he will not take kindly to being doubted in his decisions. In fact, he refuses to move forward in his investigation unless he can be guaranteed that his judgment will not be questioned.
Further, in regard to those weighty books, Hale says,
Here is all the invisible world, caught, defined, and calculated. In these books the Devil stands stripped of all his brute disguises. . . . Have no fear now—we shall find him out if he has come among us, and I mean to crush him utterly if has shown his face!
Hale is unconcerned that the Devil might outsmart him and is entirely confident that he and his arsenal of knowledge will not only best the Devil, but also destroy him. This is pride, indeed: interesting for a minister certainly.
At the end of act three, Hale has become convinced of the corruption in the Salem court. He leaves, shouting, "I denounce these proceedings, and I quit this court!" He then leaves the accused people of Salem to fend for themselves. However, in the beginning of act four, Hale returns, singing a very different tune. To Elizabeth Proctor, he now says,
Let you not mistake your duty as I mistook my own. I came into this village like a bridegroom to his beloved, bearing gifts of high religion; the very crowns of holy law I brought, and what I touched with my bright confidence, it died; and where I turned the eye of my great faith, blood flowed up.
Hale now understands the pride with which he entered the town, and he knows that he is partially responsible for the course the accusations and trials have taken. In fact, he tells Danforth, "There is blood on my head! Can you not see the blood on my head!!" He has returned to try to convince the convicted to lie and confess to witchcraft in order to save their own lives because he now believes that lying is better than giving up one's life for no other reason than one's pride. He is clearly conflicted by his role, calling it "the Devil's work," but he is also trying to soothe his conscience and do right by these innocents, whom he left before at the court's mercy.