Cassius Speaks to Brutus!

In Act 1 Scene 2, we see Cassius speaking with Brutus throughout most of the act. While talking with Brutus, he says, "And it is very much lamented, Brutus, that you have no such mirrors as will turn your hidden worthiness into your eye...". With this quote, we find out that Cassius is obviously against Caesar and his power. Cassius is talking to Brutus about this because he wants to bring Brutus to power. Well, that's what he says anyways. What he really wants to do is to just make sure that Caesar won't be in power anymore.
This quote reflects ambition because Cassius is saying that with ambition, Brutus can overthrow Caesar and come to power. This pretty much proves my initial prediction that Cassius was the antagonist in the story and that he is going to try and overthrow Caesar, in whatever way possible. Based on what Cassius said to Brutus, there are a couple of things we can infer. One inference we can make is that Cassius is going to use Brutus to try and overthrow Caesar, and then try and take the crown himself. Or another thing we can infer is that Cassius is going to try and overthrow Caesar by himself. Whichever one it's gonna be, it doesn't sound good for Caesar.