Final answer:
The given excerpt is from Macbeth by William Shakespeare, showcasing Macbeth's ambition and Lady Macbeth's manipulative nature.
Step-by-step explanation:
The given excerpt is from Macbeth by William Shakespeare. This scene takes place after Macbeth has been crowned king and he discusses his plans and fears with Lady Macbeth. The dialogue reveals Macbeth's ambition, as well as the manipulative and calculating nature of Lady Macbeth.