Sellarsの"Science, Perception, and Reality"をチラチラっと読んでいたら面白い一節を見つけた。

It is no accident that when a novelist wishes to represent what is going on in the mind of a person, he does so by “quoting” the person’s thoughts as he might quote what a person says. For thoughts not only are the sort of things that find overt expression in language, we conceive of them as analogous to overt discourse. Thus, thoughts in the manifest image are conceived not in terms of their “quality,” but rather as inner “goings-on” which are analogous to speech, and find their overt expression in speech—though they can go on, of course, in the absence of this overt expression.

(Sellars, Wilfrid. Science, Perception, and Reality)