Answer:
The allusion emphasizes the size of the faults that Brutus sees in Cassius, which will lead to an honest discussion of the roots of the friends’ conflict.
Step-by-step explanation:
Allusion is a figure of language that is used when the author wishes to refer to something already existing outside that work. An example of this can be seen in the last line of Brutus, shown in the question above. Brutus alludes to Olympus Mount when comparing the size of Cassius's faults. Mount Olympus is the tallest hill in Greece, with the allusion Brutus states that Cassius's faults are the highest in Greece. That is, the allusion emphasizes the size of the faults that Brutus sees in Cassius, which will lead to an honest discussion of the roots of their friends' conflict.