84. Disciple: If this is so, Sir, what is my fault when the mental changes resembling sound etc., and resulting in the reflection of Knowledge, My own nature, are produced in Me who am of the nature of changeless and eternal Consciousness?(from Chap.II Upadesa Sahasri Knowledge of the Changeless.)
85. Teacher: It is true that you are not to be blamed. Ignorance, as I told you before, is the only fault.
Ignorance in Vedanta (avidya) has a specific meaning. The central example of ignorance is taking something to be what it is not. We mis-take the rope for a snake, the nacre (shell) for silver, the stump for a man etc. It does not have the meaning of being ignorant of the finer points or any point of string theory for instance, a particular blank spot in other words. What the Teacher is saying is that there is a natural tendency to get fascinated by the changing panoply of consciousness and to look for a central permanent element in those phenomena. This is a structural tendency, but it is not ontological because it can be altered. How?