The scene opens with Brutus seeming tense. What details hint at his emotional state before Cassius even arrives?

In the opening scene, several details hint at Brutus's emotional state. First, his soliloquy reveals his internal conflict and anxiety about the potential crowning of Caesar as king. He is worried about the possible tyranny that could ensue, showing his concern for the welfare of Rome.

Second, his conversation with the servants also indicates his restlessness. He is unable to sleep and sends the servant to check the calendar, showing his preoccupation with the Ides of March.

Third, his reaction to the letter thrown through his window, which he reads aloud, further reveals his tension. The letter, supposedly from the citizens of Rome, encourages him to take action against Caesar, increasing his anxiety.

Finally, his tense anticipation of Cassius's arrival suggests that he is expecting to discuss something serious or troubling. All these details together paint a picture of Brutus's emotional state as being tense and anxious.