Final answer:
Cheever tells Danforth about Proctor's actions that challenge the norms and authority of the court in Act 3 of 'The Crucible'.
Step-by-step explanation:
In Act 3 of Arthur Miller's play The Crucible, Cheever reveals to Danforth that Proctor plows on Sundays and has ripped up the warrant sent for Elizabeth's arrest, which are significant because they challenge the puritanical norms and question the authority of the court.
These actions suggest that Proctor does not hold the law of the land or its religious observance in the highest regard. Danforth takes these pieces of information as evidence of Proctor's rebellious character and potential affiliation with the devil.