For some of us it was the subject being taught, for others it was the teacher, or maybe both. Regardless, doubt crept in and we began to lose faith in the validity of all of it.
Perhaps a substitute teacher or a new manual would be the answer, and the search began.
There doesn’t need to be a teacher, or a book.
Give up on finding another ‘authority’ and consider the freedom of personal understanding.
The Infinite 