To Achieve Understanding v.02

I remembered a saying by Mr. Richard Saul Wurman that said, if I'm not mistaken:

Understanding is relative to the information you already know, or something like that... "You already understand information relative to what you already understand", there you go (thank you Google). 

But a concept appeared in my head about "Replace Abstraction", not only true understanding is about updating your existing ones, but also about updating your previous abstraction. So if your abstractions weren't updated then you haven't understood anything. 

So we might think that understanding should provide certainty in replacement of abstractions, but our mind proceeds towards abstractions... time follows behind wisdom. If we were to separate wisdom and knowledge as wisdom is about how to deal with the unknown and knowledge is about knowing. Then understanding should gave birth to new abstractions as well.

So it is ok to have unanswered new questions in class, or in your mind while learning, moreover it should be the climax of your understanding. Also it is incomplete to assume successful presentation if the audience didn't came up with new questions, or it is incomplete to assume that the subject has been understood if the abstractions in you weren't renewed after being exposed to new concepts.