Macbeth reacts to the witches’ prophecies with a mix of shock, fascination, and growing ambition that quickly turns dangerous. At first, he is startled and uneasy. When the witches hail him as future king, Banquo notices that Macbeth seems to “fear” the prophecy rather than celebrate it, suggesting that it awakens something troubling in him rather than offering simple good news.
Almost immediately, the prophecy takes hold of his imagination. Once he learns he has indeed been named Thane of Cawdor—confirming part of what the witches said—he begins to believe they might be right about the crown as well. This belief sparks a dark line of thinking: he starts to imagine murdering King Duncan to make the prophecy come true. Even as the idea horrifies him and makes his “heart knock,” he cannot stop thinking about it.
At the same time, Macbeth is deeply conflicted. He wonders whether fate will make him king without any action on his part, hoping he won’t have to commit a crime. Yet he also admits that his desires are “black and deep,” and he tries to hide them even from himself, asking the stars not to reveal what he is thinking. His reaction is a struggle between his moral awareness and his ambition.
The witches do not force Macbeth to act, but their words awaken a desire that he chooses to pursue. His reaction shows how quickly ambition can take root when given even a hint of possibility, setting him on a path where imagining power becomes inseparable from committing violence.