What is a central idea of Macbeth, Act 1 Scene 7?

This scene begins with Macbeth outside his castle, contemplating whether or not he should go ahead with the plan to murder the king, Duncan. Macbeth tells himself that if he is to do it, "'twere well / It were done quickly," but it is obvious that he is shrinking from his conviction. When Lady Macbeth enters, he tells her they will "proceed no further in this business." Lady Macbeth, however, argues with him, insulting his masculinity, telling him that "when you durst do it, then you were a man." She tells him to "screw your courage to the sticking place," and that if they should fail, "we fail." Ultimately, Macbeth is persuaded and says he will embark upon the task, saying famously, "False face must hide what the false heart doth know."
This line reflects a key theme in all of Macbeth: that of appearance vs reality. Duncan believes that Macbeth is honorable and has indeed honored him, which is part of why Macbeth does not want to kill him. However, in reality, Macbeth will betray him. Meanwhile, a woman, such as Lady Macbeth, would appear to be the softer member of a couple according to stereotype of the time, but in fact, the reality is that it is her urging, and her insults of her husband's character, which drive the couple toward murder. Some other key themes and ideas in this scene are those of Macbeth being torn between his conscience and his weaknesses: his pride and his desire to please his wife and achieve greatness. This scene is also a very interesting point at which to question the extent to which Lady Macbeth, rather than Macbeth himself, is to blame for what happens in the play.