"All that impedes thee form from the golden round, which fate and metaphysical aid doth seem to have thee crown'd withal" (Act I Scene V, Page 43, Lines 27-30)
A major theme that drives the play of Macbeth is the idea of fate. Fate is a pivotal aspect of the play's major plot and some of the characters decisions. This theme mostly has to do with Macbeth and Lady Macbeth, but the Witches play a key role as well. After Macbeth has won the battle, they [the Witches] begin tempting him by predicting that he will become Thane of Cawdor and eventually King. Macbeth thinks it's all a hoax at first, but once he actually becomes Thane of Cawdor only minutes later, Macbeth's mind begins to turn. He says, "If chance will have me King, why, chance my crown me" (page 36, Act I Scene III) which makes him believe that if chance really wants him to become King, he shall become King, but he can't help have a thought in his mind that actually murdering Duncan will help speed up or ensure this process. Lady Macbeth, on the other hand, knows that they might have to take matters into their own hands. Knowing that Macbeth will be hesitant at first, Lady Macbeth knows "all that impedes thee from the golden round, which fate and metaphysical aid doth seem to have thee crown'd withal" (page 43, Act I Scene V). She knows that luck might have crowned Macbeth, but she wants to be sure of it and decides to become Macbeth's voice of reason, leading them both to agree to kill Duncan and set the play into motion. Fate is the reason why Macbeth and Lady Macbeth do what they do in the play and is the most important factor in the plot of Macbeth.