There comes a point in the work when you begin to suspect that what your teacher taught you, or rather what you learnt, was incorrect, incomplete, misinterpretted. It can't reach you, not deeply, because of fundamental differences, basic blocks in your own development, whatever. It will feel as though your foundation is shaky, as though you’re missing something. This is the point at which you start to be a real student. And unfortunately you're now all on your own. So time to grow up.