Banquo: '"Oftentimes, to win us to our harm, / The instruments of darkness tell us truths; / Win us with honest trifles, to betray's / In deepest consequences"'
Lady Macbeth: '"Come, thick night, / And pall thee in the dunnest smoke of hell, / That my keen knife see not the wound it makes, / Nor heaven peep through the blanket of the dark"'
The evil, corrupt parts of himself he tries to repress and "disguise"
Start to express themselves in the form of morbid hallucinations and spirits, suggesting your true nature can never be changed no matter how much you alter your appearance