“Stars, hide your fires! Let not light see my black and deep desires.”
“Stars, hide your fires!"=Macbeth’s ambition as a defiance of the nature, symbolising his desire to subvert the Great Chain of Being. -further emphasises this through the words “light” and “black”, as “light” symbolises God whereas “black” symbolises sin.
juxtaposition-highlights Macbeth's guilt as he wants to hide his "desires" from God because he is aware that they are sinful-Jacobean notions that you can avoid judgement by abstaining from evil thoughts.
“light” also carries connotations of illumination.- contrast of “light” and “deep” refers to Macbeth’s repression of evil, as he wants to eliminate this ambition from the forefront of his psyche.
Shakespeare presents guilt as a measure instated by God to ensure the “nob[ility]” of his disciples, as it initially prevents Macbeth from acting on his dark “desires”.