As you well know many subjects written about in scripture are only alluded to, not necessarily directly connected to the literal meaning of the words used.
on the appointment of presbyters.
When these men have undergone, with blamelessness of conduct, a two year preparation in the fundamentals of the community, they shall be segregated as especially sacred among the formal members of the community. Any knowledge which the expositor of the law may posses but which may have to remain arcane to the ordinary layman, he shall not keep hidden from them; for in their case there need be no fear that it might induce apostasy.
Of religious discussion.
No one is to engage in discussion or disputation with men of ill repute; and in the company of froward men everyone is to abstain from talk about (keep hidden) the meaning of the Law
Dead Sea scrolls, manual of discipline
Here it's clear that there is hidden teaching in the law that was withheld from the ordinary layman thousands of years ago.
This is why Jesus said, "No one lights a candle and then hides it under a bushel, they put it on a lamp stand so everyone in the room can see.", since the law was intended to be a light to the nations, a light for the entire world.
