Final answer:
Brutus' honor is evidenced by his reputation, which allows him to influence others to join his cause, suggesting that his actions are considered honorable due to the trust he commands.
Step-by-step explanation:
The evidence of Brutus' honor can be found in his ability to influence others regarding the noble nature of his cause. When we examine the passage where Brutus tries to persuade Ligarius to join his cause, it's evident that he believes in the honorability of their endeavors. He is not taking advantage of Ligarius's sickness or appealing to any fame Ligarius may have, but rather is leveraging his own reputation for honor to inspire Ligarius. The perception that Brutus' exploits are assumed to be honorable because of the trust others place in him is the basis of the argument.