"Methought I heard a voice cry 'Sleep no more! Macbeth does murder sleep'," This quote shows the theme of Guilt in Macbeth. Only a few minutes after the murder of Duncan, Macbeth imagines that he can hear voices accusing him. He is so guilty that he starts to lose his mind.
“Glamis hath murdered sleep, and therefore Cawdor Shall sleep no more. Macbeth shall sleep no more.” Once Macbeth has commited the act he is plaqued constantly by guilt. One of the ways this manifests itself is through his lack of sleep, almost insomia. Maybe it has something to do with the fact that he killed Duncan in his sleep, or maybe not.
"False face must hide what the false heart doth know." This quote shows the theme of deceit in Macbeth. It says that Macbeth and Lady Macbeth must remain to look like innocent hosts, while planning their murder.
"This is a sorry sight." ... "A foolish thought, to say a sorry sight." These quotes are from Macbeth and Lady Macbeth respectively. They demonstrate the duality of good and evil in Macbeth's life. He and his wife must work together to achieve their goals, but Macbeth seems to be more 'good' than his wife, who is more 'evil'.
Lady Macbeth, by this point is almost obsessive about the blood on their hands, showing that she also wasn't completely unaffected by the act. It also shows how the blood, and hence the blame clings to her.
"we but teach Bloody instructions, which, being taught, return To plague the inventor" This quote demonstrates the famous themes of fate and karma. It shows that Macbeth is worried that by the murder of his king, some ill fate shall befall him too.
"Confusion now hath made his masterpiece!" This quote shows how the murder of Duncan, is the work of confusion itself. To Macbeth the whole situation is mixed up and crazy, him killing a king so quickly after being loved and respected by him. Confusion and deciet is also one of the main themes of the play.
"I'll go no more: I am afraid to think what I have done; Look on't again I dare not." This is another quote describing Macbeth's guilt. He needs to go back to the scene of the crime, but he refuses to, as he is disgusted by what he has done.
"The raven himself is hoarse That croaks the fatal entrance of Duncan" This is a quote from Lady Macbeth describing how she is glad that Duncan is coming (to die). The raven is a very common symbol of death, and this quote is no exception.