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To put the matter in Aristotelian terminology, visual impressions are prior in the order of being to concepts pertaining to physical color, whereas the latter are prior in the order of knowing to concepts pertaining to visual impressions.
Wilfrid Sellars -
[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.
Wilfrid Sellars