“I will Confess Against Myself” (Day 33 of the Holy Rule)

The fifth degree of humility is that "he hide from his Abbot none of the evil thoughts
that enter his heart
or the sins committed in secret,
but that he humbly confess them."

The next degree of humility is self-accusation.  In practical terms, it means to have a spiritual advisor and a confessor.  We reveal our evil thoughts and inclinations to the one and our sins to the other. We do not keep secrets from God but use his intermediaries to help draw out the evil within us in an objective way similar to either a physician or surgeon of the soul.  

On this point, to self-medicate as if you could minister your own conscience by your own will is a silly and dangerous thing.  The literal meaning of consciencia in Latin is "knowledge with", not so much "knowledge within."

According to an etymology dictionary, "The Latin word is probably a loan-translation of Greek syneidesis, literally "with-knowledge." The sense development is perhaps via "to know along with others" (what is right or wrong) to "to know right or wrong within oneself, know in one's own mind" (conscire sibi)."  It is the former from which the later emerged, just as moral formation requires knowledge outside of you regarding questions of right and wrong, but one cannot confiently say that its meaning was always fixed to suit the modern meaning of conscientiousness.  On that interpretation, it also seems obviously inconsistent with the communal character of cenobites and what the Holy Father outlines above.

Semantics aside, to hold the teaching authority and good counsel of our superiors in contempt is averse to the spirit of true humility.  Here, we explicitly see Benedict advising against secrecy in questions of spiritual progress.