When Duncan named Malcolm as his heir, Macbeth considered killing him. Knowing that it would be wrong to kill him and that he would ruin his reputation helps him to repress these feelings.
The conflict between Duncan's reputation and the public's opinion of him as a righteous and good ruler is what gives rise to Macbeth. In the speech's concluding section, the speaker imagines Duncan's goodness and compassion being announced from a sky filled with storms, perhaps by angels and cherubim. This gloomy vision, which uses imagery similar to that of the biblical Day of Judgment (such as "trumpet-tongued"), gives place to a persistent self-doubt. As opposed to how he sees the cherubim and angels, who are "horsed atop the sightless couriers of the air."
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