So now even Maverick Philosopher agrees that there is a separate source of moral information--the conscience. That is what Leonard Nelson calls non intuitive immediate knowledge.

[I am being short here, but just as a brief explanation: Maverick Philosopher is from the Analytic School and this is a huge step for a very important Analytic Philosopher agree with Leonard Nelson and the Friesian School in this area. It is almost dogma by them to say there is no such thing as immediate knowledge 

Another note: immediate  non intuitive knowledge [not through reason nor the five senses] was postulated in order to find a justification for the questions like where, when, [space time], why, [causality] etc. Empirical knowledge was out because of the problem of induction and knowledge of causality  by reason was attempted by Kant, but that was found to be problematic also. Most think that Kant's justification for these categories simply defies  reason.    It was later that this immediate non intuitive was expanded to include faith. But this expansion is significant in that it is really just an improvement of Kant, and not a completely different approach.