To quote Politis:
"Aristotle's examination and defense of PNC occupies a pivotal position in the Metaphysics. He argues, on the one hand, that PNC is a necessary condition for the possibility of thought and language; but, on the other hand, that PNC is true of the things themselves and of things without qualification, it is not only and not primarily true of things in so far as we can think and speak of things. But it will emerge that the upshot of his overall argument is this: we must engage in metaphysics, i.e. in the project of asking 'What is being?' and 'What is primary being?', and we must search for an answer to these questions, if we at all want to consider how thought and language are possible. So, ultimately, the aim of the examination of PNC is to provide vital motivation for engaging in his own overall project, i.e. metaphysics as he conceives it - indeed to show that this project is, in a way, inescapable."
If I understand this correctly, this means that engaging in metaphysics entails thinking about and/or discussing the PNC.
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