In act 1 scene 3 Banquo and Macbeth are talking about the premonitions the three witches have made about Macbeth becoming king. Macbeth thinks it is all truth whereas Banquo says “But ‘t is strange: and oftentimes, to win us to our harm, the instruments of darkness tell us truths…” Banquo expresses that he is skeptical about the witches premonition. When he says this he is describing the witches as darkness and that they are telling him false truths. He also uses personification where he describes instruments or the premonitions told by the witches being played by darkness; the witches. He says the darkness has to play their instruments to win us to our harm which means that the witches would have had to told Macbeth that he was going to be king for it to happen. Once they have told him he will do anything to complete their premonition as now he believes it has to happen. Without them telling him this it wouldn’t have been seen as a possibility for him. This could be seen as an act of darkness because now this will force him to do things like kill Duncan and his son all because of the witches.