According to this lesson, we have total freedom to do what we want. Because God has given to us that freedom, that we can choose for ourselves and lives.
But the thing is that, because you have freedom doesn't mean you can just do anything. God is not a God that will begin to force you into doing anything, but has given you the very freedom to dictate for yourself.
You know what is good and what is bad. If you fight your wife, is it a good or a bad thing? Absolutely it is not good, because God is against domestic violence. And even with a common sense you know that domestic violence is bad, then how much more is reading a satanic book?
I believe that even people who doesn't know God, knows that reading satanic book is evil and completely against God's will and plan. God has given us a book (The holiday Bible) this book contains all that we need to live out lives.