Macbeth is at his castle talking to his wife about what was writen in the letter

Lady Macbeth devises the perfect plan but Macbeth feels that he ows to much to Duncan to kill. Lady Macbeth questions Macbeth's manliness. Trying to goad him into killing Duncan

Macbeth ponders a momnet and thinks Duncan has done no wrong and that it doesnt warent his death

Macbeth ponders a momnet and belives his wife is right, as he is manly