“It is a fairy-tale told by an idiot, full of nouns and fury signifying nothing”?

Can someone explain this quote, first said by Macbeth in Act 5, Scene 5, and then used by Faulkner in his innovative, "The sound and the fury"?
Macbeth, in this scene, is referring, I believe, to life surrounded by general. True, he says it after his wife's death, but it is more approaching a moment of epiphany when he finally "realizes", that life really is nothing but "sound and fury", completely meaningless. Also, I believe this quote have something to do with another one of Shakespeare's famous quotes- "All the world's a stage". Here, also, it seems Shakespeare refers to go as a play, or a stage, where all the people are only just actors, unable to control their own destiny (as Macbeth is unable to adjustment his), and take their own goals and actions path to seriously since eventually, we all die, and there is really nothing departed of us (which is why our lives, or tales, are "signifying nothing").
Macbeth has just hear the news of his wife's death (suicide), and is voicing the pointlessness of existence (his and his wife's, at this point). In other words, life is meaningless. It is last for a brief time and is full of "sound and fury", but in the end, nought lasts. Source(s): enotes.com

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