the mind > mental capacity > knowledge > secrecy, concealment > a profound secret, mystery > [noun] > initiation into mysteries > initiate (3)
A person initiated into mysteries, esp. religious mysteries.
= mystes, n. Obsolete. rare.
= omphalopsychite n. at omphalo-, comb._form affix; (also more widely) a person who indulges in navel-contemplation.