I think it's true that they can't inspire anything beyond what they can comprehend for themselves (for some I've seen, that range is pretty limited for what they charge).

Mostly, I think they know some things that the client doesn't know or can't see--either because they've studied it or, in rare cases, they have lived it—and they aren't involved emotionally so they can have a different perspective that can be helpful.

A therapist should do everything she/he can to get their act together enough to keep from screwing up a client. But beyond that, I don't think they are super evolved or anything.