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Full Idea
Unless mental properties have causal powers, there would be little point in worrying about them.
Gist of Idea
Mind is only interesting if it has causal powers
Source
Jaegwon Kim (Philosophy of Mind [1996], p.118)
Book Ref
Kim,Jaegwon: 'Philosophy of Mind' [Westview 1998], p.118
A Reaction
This doesn't, on its own, actually rule out epiphenomenalism, but it does show why it barely qualifies as a serious theory. One might, in fact, say that we simply can't worry about something which has no causal powers. The powers might not be physical…