While thinking about this "understanding without knowning" (which some other people call tacit knowledge) I was talking the infinite insight knowledge/understanding can give you. This has to do with harmony. When everything you know/think/understanding are going in the same "direction". This is a kind of tacit knowledge that you are right. But as it's a kind of knowledge that is hard to describe (maybe that's something that should be worked out) and therefore noone can really contradict you and maybe you are totally wrong. So one has to be very cautious with one's feelings. Even though it's usually healthier to trust them.