In this passage, Shakespeare uses many different techniques to present Macbeth’s deteriorating state of mind. The semantics of the speech is that Lady Macbeth has died and Macbeth is questioning the point of living at the present moment. The “moment” being an army of 10,000 English men and an army of traitors outside his castle.
One way Shakespeare portrays Macbeth’s insanity is through iambic pentameter, or the lack of it… The first line: “She should have died hereafter” is not accompanied by iambic pentameter. Throughout most of the play Macbeth and other upper class characters speak in iambic pentameter. Throughout the start of the play Macbeth is sane and morally boring. Now, his wife is dead, all his friends have turned against him, and he is losing his sanity. Shakespeare shows Macbeth has changed for the worse by stopping him from speaking in rhythm. He is no longer a respectable nobleman, but a frail and unstable man.
Another way Shakespeare presents Macbeth’s deteriorating state of mind is through the metaphors he speaks. “Life’s but a walking shadow.” A shadow has nearly no usefulness, unless you want to take shelter from the sun. This has two meanings to it. One of them is that life is that life is pointless. People just drift around like shadows and eventually they die. There is a recurring theme of hiding from God in Macbeth, so that his “good actions are hidden from him; God is always portrayed as being in the sky, but is hidden by darkness. Now, God is the sun, huge and bright and powerful, and Macbeth has nowhere to hide anymore, except in his own fragmented mind which is a shadow of what it used to be.
One other metaphor Macbeth uses is “all our yesterdays have lighted fools the way to dusty death. Macbeth describes life as “yesterdays”, which have done nothing but lead us to our death. He then says “Out, out, brief candle!”. By this, he means that he wants to die. He has given up on life as he has nothing worth living for: his wife has died, he has no allies.
Shakespeare uses suspension of disbelief to show Macbeth’s insanity. The audience would have been choosing to believe that the performance they were seeing was real. That the actors were real, that the props were real etc. When Macbeth says “Life’s but a walking shadow, a poor player that struts and frets his hour upon the stage and then is heard no more”, he acknowledges the fact that he is only an actor on a stage, entertaining people. In this sense, Shakespeare suspends the audiences disbelief so that they feel even more strongly that Macbeth is losing his mind, as he is no longer speaking about the play, but the whole world.

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