What does this critical lens quote mean? "Man is the only animal that blushes or has need to".

Answer 1

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You need to think of that quotation ("quote" is a verb; "quotation" is a noun) as it reflects whatever is happening in the piece of literature to which you're applying it.

Also ... ask yourself why people usually blush? If you see someone blushing, what do you think has happened or been said?

Answer 2

Man is the only being that has a "conscience".... a sense of right and wrong. And therefore, man is the only being that does something that he knows is wrong.