What can we gain from rationality?

If you are already an atheist that does not believe in ghosts, what can you learn from rationality? I’d love to be wrong about lots of things but my problem is, I think I’m right.

As far as I can tell, none of this reflective thinking has lead to deeper understanding of consciousness. (A subject I wish I wasn’t so interested in, because its study seems so futile).

If you feel like it, please tell me about any particular instances where actively working on your own thought processes has lead you to realize you were wrong about something (other than blatantly false things like those I mentioned above) or if the same program lead to any new understanding of consciousness.