In the first few lines of his soliloquy, Macbeth says "If it were done when 'tis done, then 'twere well it were done quickly;" I think what Macbeth meant by this, is that if the murder could be finished as soon as the deed was done, it would be good to have it finished quickly. Clearly, such actions do have many consequences and aftermath and the rest of his soliloquy makes it clear that Macbeth already knows this. In my opinion, Macbeth did not want to kill Duncan but was too much of a pushover by his wife and was taken over by his devious ambitions. This is also his tragic flaw as he explains in his soliloquy. Macbeth mentions that he has "no spur to prick the sides of [his] intent" This is maybe failing to realise the obvious, as when his wife enters he is spurred on a great deal. Shakespeare also uses the metaphor of a horse to describe Macbeth's ambition as "vaulting". This is quite effective as its describing how Macbeth could "o'er-leap" himself and end up falling, shamefully. I think, throughout the scene, Macbeth avoids using the words "murder" or "death". Instead, he uses euphemisms such as "surcease", "assassination", "the deed", "taking off" and “great quell”. I suspect this is telling us that he wants to hide from himself the true meaning and the reality of his actions by not putting it as straight as that. Macbeth tries to think of all the reasons why he should not be murdering Duncan, “First, as I am his kinsman and his subject, strong both against the deed; then, as his host” because he knows that he has a duty to protect the king Duncan, both his kinsman and his host. Macbeth seems to know that by breaking this trust he would be breaking his own morals and principals. Macbeth however continues along the same lines, now considering Duncan's kingship. He asserts that Duncan "hath borne his faculties so meek" and this is very difficult to deny. Duncan has certainly been a fair and good king to him, rewarding him with titles, like when he turned Macbeth into a thane. At the end of the soliloquy, Macbeth compares Duncan‘s many virtues to "angels, trumpet-tongu'd". The poetic language makes the 'heavenly' image all the more effective, while in contrast to the ‘demonic’ and ‘hellish’ language Macbeth associates with Duncan's death, like when he says, "deep damnation".
When Lady Macbeth enters, Macbeth attempts to make a stand against his wife, saying "We will proceed no further in this business". This comment must have come as a result of his soliloquy and it is clear that he does not want to go through with the plan. He tries to justify his 'decision' by explaining how Duncan has "honour'd me of late". Again he uses this idea of honour to add to his argument and the fact that it is his vocation to protect the king. Lady Macbeth retaliates by accusing Macbeth of breaking his promise and questioning his bravery and virility: “and live a coward in thine own self esteem, letting ‘I dare not’ wait upon ‘I would’. Macbeth then strikes back by telling Lady Macbeth that he dares to do “all that may become a man”. I think Lady Macbeth is very sure of herself, and so supremely-confident about what she wants to do, that she is blinded by the possible consequences of her actions. Consequences that we now know haunt the back of Macbeths mind as he realises the immorality of murdering the king. But, however noticeable the reasons he gave to Lady Macbeth were, they were nothing like as powerful as the ones he tortured himself with a few moments earlier. This shows his difference in the manner of thought and speech he uses on his own and the manner when put up...