Quote 10
CASSIUS
[...]How many ages hence
Shall this our lofty scene be acted over
In states unborn and accents yet unknown! (3.1.124-126)
Cassius predicts how the actions of the conspirators against Julius Caesar will be "acted" out in future "states unborn and accents yet unknown." This is Shakespeare's way of winking at the audience, who is watching this play centuries later, in a "state unborn" (16th century England), being performed in a language that didn't exist yet (English).
Quote 11
CASSIUS
[Aside to Brutus] You know not what you do. Do
not consent
That Antony speak in his funeral.
Know you how much the people may be moved
By that which he will utter? (3.1.255-259)
When Brutus grants Antony permission to speak at his friend Caesar's funeral, Cassius seems to be the only person who knows how dangerous Antony's speech will be. As we know, Antony plays the crowd perfectly (just like Caesar did back in Act 1), and his delivery of a carefully crafted speech helps incite a civil war.
Quote 12
CASSIUS
For once, upon a raw and gusty day,
The troubled Tiber chafing with her shores,
Caesar said to me 'Dar'st thou, Cassius, now
Leap in with me into this angry flood
And swim to yonder point?' Upon the word,
Accoutred as I was, I plungèd in
And bade him follow; so indeed he did.
The torrent roared, and we did buffet it
With lusty sinews, throwing it aside
And stemming it with hearts of controversy.
But ere we could arrive the point proposed,
Caesar cried 'Help me, Cassius, or I sink!'
I, as Aeneas, our great ancestor,
Did from the flames of Troy upon his shoulder
The old Anchises bear, so from the waves of Tiber
Did I the tired Caesar. And this man
Is now become a god, and Cassius is
A wretched creature and must bend his body
If Caesar carelessly but nod on him. (1.2.107-125)
There's nothing like a little (un)friendly male competition, is there? Here, Cassius tells Brutus the story of how Caesar, as a young boy, challenged him to swim across the Tiber River, where Caesar's show of masculine bravado nearly cost him his life.