Quote # 1: "Is the accuser always holy now?"
John Proctor says this to Reverend John Hail in act II. This is when they have come to Proctors house with a warrant for his wife. Reverend Hail starts to say that if she is innocent then the court will prove it. Proctor cuts him off and says,"If she is innocent! Why do you never wonder if Parris be innocent, or Abigail?" It means that he thinks that they should be looking at the people pointing the finger and see if they are so innocent themselves. They have just assumed that because Abigail is accusing people she must be doing Gods work so therefore she must be pure and good, which was clearly not true.
Quote # 2: "Think you be so mighty that the power of Hell may not turn your wits?"
Abigail Williams says this to Deputy Governor Danforth in act III.
This is when they are in court, just after Mary Warren confesses to pretending to see spirits. Danforth asks Abigail if she was also pretending and she replies defensively and openly threatens him. Her saying this shows that she knows that she is holding the power. No one wants to get on Abigai's bad side because she is the ring master in this circus and she can accuse whoever she likes. She is basically telling Danforth that he better watch what he says to her.
Quote # 3:"You=re the Devil's man!"
Mary Warren says this to John Proctor in the end of act III. They are in court, Abigail and the girls are acting as if they see Mary Warrens spirt attacking them in the form of a bird. Mary Warren just confessed to pretending to see spirits then suddenly changed her story when it looked...