In this soliloquy, which is found in Act 1, scene 7, lines 1–28, Macbeth debates whether he should kill Duncan. When he lists Duncan’s noble qualities (he “[h]ath borne his faculties so meek”) and the loyalty that he feels toward his king (“I am his kinsman and his subject”), we are reminded of just how grave an outrage it is for the couple to slaughter their ruler while he is a guest in their house. At the same time, Macbeth’s fear that “[w]e still have judgement here, that we but teach / Bloody instructions which, being taught, return / To plague th’inventor,” foreshadows the way that his deeds will eventually come back to haunt him. The imagery in this speech is dark—we hear of “bloody instructions,” “deep damnation,” and a “poisoned chalice”—and suggests that Macbeth is aware of how the murder would open the door to a dark and sinful world. At the same time, he admits that his only reason for committing murder, “ambition,” suddenly seems an insufficient justification for the act. The destruction that comes from unchecked ambition will continue to be explored as one of the play’s themes. As the soliloquy ends, Macbeth seems to resolve not to kill Duncan, but this resolve will only last until his wife returns and once again convinces him, by the strength of her will, to go ahead with their plot.