What the audience learns from these lines "be innocent of the knowledge dearest chuck/till thou applaud the deed" is that Macbeth is not going to tell his wife about his plan to murder Banquo until after the murder has been committed.
Explanation:
After Macbeth planned to kill Banquo he gives a bit of information to Lady Macbeth with these lines from "Macbeth" by William Shakespeare in act 3, scene 2, then she asks for more specific details about the event to happen, but he says that she shouldn't know, as a demonstration of how much he cares for her.
