I believe you're incorrect, Jossi.  The English language definition of "secret" includes "confidential" as a synonym of "secret."  This is a matter of semantics, but the meaning is the quite the same, especially in this context.  Please peruse and compare Dictionary dot com definition of "secret, dictionary dot com's thesaurus, and Dictionary dot com definition of "confidential," and Dictionary dot com thesaurus "confidential.  Maharaji's required promise statement confirms what the scholars say. I don't believe this should be a matter of contention because it's really the truth and I don't believe there is a negative connotation to it, either.  The scholars confirm the truth of the matter.  My sentence revision should stand, imo.  Cynthia