Act 1, Scene 4: 'Stars hide your fires, let not light see my black and deep desires'
Presents his initial innocence and loyalty, but also how the seeds of ambition have already been planted by the witches.
Inner conflict shown by personification in 'stars hide' showing he is ashamed to want more power.
Juxtaposition of 'light' and 'black' shows he hasn't been completely corrupted by ambition but wants to explore it.
Context: Goes against Divine right of Kings as witches were seen as terrible so Macbeth is making a fatal error from the very beginning.