Final answer:
In 'Macbeth', he decides to find out more about his destiny after the witches predict he will become Thane of Cawdor and king, leading him to seek confirmation and guidance on these predictions.
Step-by-step explanation:
In Shakespeare's Macbeth, Macbeth decides to seek more information about his fate and potential rise to kingship after meeting with the three witches who prophesy his future titles. The witches hail him as the Thane of Cawdor and future king, which intrigues Macbeth and sparks his ambition. As he grapples with these predictions and their implications, Macbeth is driven to seek further confirmation and guidance on how to achieve the power that seems to be promised to him.