 Studying Macbeth, let's look at the exchange between Ross and Lady Macduff when he's trying to get her to escape. In Act 142, Ross defends Macduff's decision to run away. He tells Lady Macduff that Macduff is noble, wise, judicious and best-knows. Now here, these adjectives belong to the rule of three. In other words, he's basically saying that Macduff probably can see through Macbeth's evil deeds. Ross says, from what we fear, yet know not what we fear. Now, the repetition of the words, fair, essentially show that there's a hidden enemy that's causing Scotland to degrade. They don't know what it is, but he's hinting that it might be Macbeth. But Lady Macduff is still really angry at her husband, and what she sees is a betrayal that he left Scotland. She says, fathered he is, and yet he's fatherless. Now here, she's talking about her son, and she feels like her husband is a bit of a traitor, and she speaks this in Niamh bit pentameter.