What well known speech in amenrican history does king echo in saying five score years ago?

It's to know your purpose before you read something because a purpose can:

Brutus: but as he was ambitious, i slew him. . who is here so base that would be a bondman? if any, speak, for him have i offended. who is here so rude that would not be a roman? if any, speak, for him have i offended. who is here so vile that will not love his country? if any, speak, for him have i offended. i pause for a reply. which rhetorical device does brutus use in this excerpt?

Whats the importance of gaining a general understanding of and interpretation of the work of literature. explain what the importance is to me