Really, the fundamental, ultimate mystery -- the only thing you need to know to understand the deepest metaphysical secrets -- is this: that for every outside there is an inside and for every inside there is an outside, and although they are different, they go together.
But whether I become a believer or remain an agnostic, my belief or disbelief must derive its source from within, not from without. I, myself, must create its symbols. The transcendental is that which produces its own form. I will never discover its secret if I do not find it in my own heart; if I do not possess it already I shall never be able to acquire it.
As long as you don't fly openly in the face of society, society doesn't ask any inconvenient questions; and it makes precious short work of the cads who do. There are no secrets better kept than the secrets everybody guesses.