I would presume that "speaking in oracles even though understood by none" is intended to mean: "I will speak carefully and accurately and precisely in a way that conveys the truth to those who are capable of understanding," with the point being that I am going to speak the truth whether the people who are hearing me are capable of understanding it or not. What's generally wrong with Oracles? Not that they are speaking with certainty and sounding profound, but that they are speaking with certaint…