A therapy can succeed if the therapist is truly and completely mindful of his or her own feelings. If a therapist can recognize without hindrance, without internal censorship, what those feelings or emotions are. Only then can a person distinguish between things that are and feelings about those things....

The problems arise when feelings cannot be recognized. When that happens, one begins to confuse "feelings" and "things". One begins to use words that mix the two, and mix them while not realizing that they are being mixed...

If a therapist cannot freely access her or his own feelings, and to the extent which that failure occurs, no therapy is likely fully to succeed. The "match" between therapist and client reflects how damaged is the ability to recognize what one's actual feelings are in both the client and the therapist. The more damaged the client's system the less impaired the therapist's system must be to produce a successful outcome...

I agree with your post ..... and especially here-- the therapist must be "well" enough to see a way "out"(towards healing) for the client.... and be able to accompany client in a healthy direction.
I think a "good" therapist can get out of their own head(experiences/values/own thoughts) and go fully into the clients head and feel/think the way the client does-- that is a good way to achieve success in therapy-- nothing like true empathy and validation.