One of the characteristics of philosophy as a field of inquiry is that — unique among human endeavors — it also inquiries upon itself. This was true since the times of Socrates and Epictetus, of course. Here is how the latter puts it in his Discourses:
“Now if you are writing to a friend, grammar will tell you that you need particular letters; but it will not tell you whether or not you should write to your friend. The same holds in the case of music’s relation to song. It will not say whether at this moment you should sing or play the lyre, or whether you should not do so. Which faculty, then, will do so? The one that studies both itself and everything else. And what is that? The faculty of reason. Yes; for this is the only faculty we have inherited that can perceive itself — what…
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