Among their secrets is also the knowledge of the two upbringings in this world, which are the natural upbringing and the spiritual upbringing, and what their origins are, and the knowledge of the two upbringings in the hereafter, the natural and the spiritual, and their origins, and the knowledge of the two upbringings, the upbringing of this world and the upbringing of the hereafter, are six sciences that must be known.