How does Shakespeare use language and imagery to establish Macbeth's frame of mind in these lines?

Is this a dagger which i see before me/ the handle toward my hand? come, let me clutche thee/ i have thee not, and yet i see thee still/ Art thou not, faftal vision, sensible/ to feeling as to sight or arth thou but/ a dagger of the mind, a false creation/ proceeding from the heat oppressed brain?/ i see thee yet, in for as palpable/ as this which now i draw./ thou marshall'st me the way that i was going/ and such an instrument i was to use/ mine eyes are made the fools o' the other senses/ or else worth all the rest: i see thee still/ and on thy blade and dudgeon gouts of blood/ which was not so before. There's no such thing/ it is the bloody business which informs/ thus to mine eyes. Now o'er the one half world/ nature seems dead, and wichked dreamse abuse/ the curtain'd sleep; witchcraft celebrates/ pale hecate's offerings, and wither'd murder/ alarum'd by his sentinel, the wolf/ whose howl's his watch, thus with his stealthy pace, with tarquins's ravishing strides, towards his design/ moves like a ghost. thou sure and firm set earth/ hear not my steps, which way they walk, for fear thy very stones prate of my whereabout, and take the present horror from the time/ which now suits with. whiles i threat, he lives/ words to the heat of deeds too cold breath gives./ (a bell rings) i go, and it is done; the bell invites me. hear not duncan; for it is a knell/ that summons thee to heaven or to hell!