Even though Support apes are the only nonhuman creatures able to learn human language, Support no ape has ever used its human language skills to ask such philosophical questions as, "How am I different from all other creatures?" Therefore, philosophical thought is unique to humans.
Only humans are capable of philosophical thought. Why? Because the only other creatures capable of human language are apes, but they don’t ask philosophical questions in human language. (So only humans ask philosophical questions in human language.)
The author concludes that only humans as are capable philosophical thought on the basis that only humans can ask philosophical questions in human language. But what does human language have to do with philosophical thought? The author must assume that philosophical thought requires you to ask philosophical questions in human language.
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