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Language (n.) was for Descartes the mark of a mind: ask a person about something new and the answer is neither caused nor predetermined, yet still fits the situation.
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Language (n.) used in the ordinary creative way, free of stimulus control, new, apt and coherent, was for the Cartesians the only sure sign that another creature has a mind.
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Language (n.) comes to every normal child, while even its rudiments stay out of reach of an ape that is otherwise clever.
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Language (n.) is the fourth source of error: we store our thoughts in words, and then can scarcely separate what we think from the words chosen to say it.
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Language (n.) misleads the mind: we say we see the wax, when in fact we judge it.