The knowledge I have learned about myself and Life from the books I have read by L. Ron Hubbard. I have come to have certainty on who I really am as a spiritual being and what my purpose is; the certainty is the key.
How precious is that? Certainty. Certainty of myself as a being! And what I am about as ME.
I see so many people struggling with those two things - who they really are and what is their own purpose.
The data one can glean from the aforementioned author's works is just amazing...and worthwhile.