Emmet Fox (a well-known writer on meditation) says that prayer is as effective as
psychotherapy. (Or rather, he says that there isn't any benefit that psychotherapy
offers that prayer isn't more effective at accomplishing.)

I don't know about that one, frankly. I know that prayer is effective if it is approached in the right way. But that's another subject altogether.

As for Bipolar illness, there are many things that we can do to make the illness better if we become pro-active in our care.