A hintergedanke is a thought way, way, way in the back of your mind. Something that you know deep down but can’t admit.— Alan Watts (@AlanWattsDaily) October 29, 2013
I read that one person referred to a Hintergedanke as a hidden agenda. Well I suspect strongly that if it is something we can't admit, then it is in fact our own 'hidden agenda' as such. I see it explains it perfectly. I see that it actually sums it up. Our duel nature is not all beer and skittles.