Passage Summary: Some people think every word we say is a metaphor, but that's impossible because you can't have a 'non-literal' meaning unless there's a 'literal' meaning to compare it to.

Conclusion: The claim that all language is metaphorical is incorrect.

Reasoning: A metaphor is by definition a nonliteral use of a word, and for a nonliteral use to exist, there must be a literal use to contrast it with.

Analysis: The author is directly rebutting the 'extremist' view mentioned in the second sentence. I identified the conclusion by looking for the pivot word 'But,' which signals the author's stance against the preceding claim. The final sentence serves as the premise, providing the logical necessity that literal language must exist for metaphorical language to be possible.