"[T]he categories of intentionality are nothing more nor less than the metalinguistic categories in terms of which we talk epistemically about overt speech as they appear in the framework of thoughts construed on the model of over speech."

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Some people would claim that things like love, joy and beauty belong to a different category from science and can't be described in scientific terms, but I think they can now be explained by the theory of evolution.

— Stephen Hawking