Numerous people and factors push Macbeth into killing the king. The main factors are:

I start with probably the most influential character upon Macbeth, his wife, Lady Macbeth. Lady Macbeth believes what the witches have said and therefore believes that she will become the queen.

'Have I thought good to deliver thee'

She obviously has a great ambition and will do almost anything to fulfil her ambition. This shows a great evilness in her

She is also reluctant to accept Macbeths original thought of leaving the idea alone

'What beast was't then that made you break this enterprise to me'

She appears supremely confident about murdering Duncan even though Macbeth is not which al

Another factor that may be connected with the witches or may not is the dagger soliloquy.

Overall Lady Macbeths ambition, confidence and naivete is perhaps the major factor in pushing Macbeth into the murder of Duncan. She does not think of the consequences of the murder so she is 100% behind Macbeth killing Macbeth, which makes it difficult for Macbeth to go against her.

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Approximate Word count = 615
Approximate Pages = 2 (250 words per page double spaced)