Final answer:
The speaker in the provided excerpts from Shakespeare's 'Macbeth' is Macbeth himself. He is involved in conversations regarding his future as predicted by the witches and his subsequent actions.
Step-by-step explanation:
The speaker in the given content is Macbeth. Throughout the excerpts provided, Macbeth is seen engaging in conversation with various characters including Banquo, Lady Macbeth, and the Witches, discussing topics such as the prophecies of him becoming thane of Cawdor and eventually the king. Notable parts of the text include Macbeth's aside, where he ponders the prophecy and his ambition, as well as his discourse with Banquo, where they reflect on the witches' predictions and their respective futures.
In the play 'Macbeth' by William Shakespeare, Macbeth interacts with the central themes of fate, power, and ambition, which can be seen throughout the dialogue supplied from the play. Macbeth's lines give insight into his thoughts and the growing internal conflict that arises from the witches' foretellings. This characterization and thematic exploration are crucial elements of Shakespeare's work and contribute to the dramatic tension within the narrative.