In this passage, Cassius is essentially telling Brutus that he knows him better than Brutus knows himself. He suggests that Brutus may be blind to his own flaws or qualities, and Cassius offers to be a mirror to reflect these aspects back to Brutus. By stating that he will "modestly discover to yourself That of yourself which you yet know not of," Cassius is implying that Brutus may not fully understand his own nature, and Cassius feels it's his duty to enlighten him.
Cassius then provides examples of behaviors that he claims Brutus might not be aware of in himself, such as being overly trusting, fawning on others, or being too open about his feelings in social situations. By highlighting these potential traits, Cassius is suggesting that Brutus may be unaware of how these behaviors could be perceived by others, particularly in the political context of their time.
Overall, Cassius's speech here reveals his perception of Brutus as someone who may lack self-awareness or insight into his own character, and Cassius positions himself as someone who can provide Brutus with a clearer understanding of himself.
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