What reason does Cassius give for needing Brutus in the conspiracy?

Cassius believes that Brutus's honor will lend credibility to the conspiracy against Julius Caesar. Brutus is widely respected in Rome for his integrity and noble character. By involving him, Cassius aims to strengthen the conspirators' cause, making it appear more just and legitimate to the public. The perception of Brutus as an honorable man can help the conspirators gain public support, as people are more likely to rally behind a cause that is seen as virtuous and aligned with honorable motives. This turn of events suggests that Brutus’s involvement is crucial not only for the success of their plot but also for framing their intentions in a positive light, leveraging his reputation to bolster the conspiracy’s credibility.