|Alfred North Whitehead|
"Whenever a book is written of real educational worth, you may be quite certain that some reviewer will say that it will be difficult to teach from it. Of course it will be difficult to teach from it. If it were easy, the book ought to be burned; for it cannot be educational. In education, as elsewhere, the broad primrose path leads to a nasty place."
This is like how Aristotle taught that true learning is accompanied by pain. Sorry folks, but that's how it is!