Summary of a chapter in 'A Thomas Jefferson Education' - about our national book

I was reading the book 'A Thomas Jefferson Education' with my family the other day, which is a book covering the state of our modern day society and how we can better it with education. I took some notes (basically a summary of what the chapter was saying), and I have put them here:

If a people chooses mediocrity, they end up with a mediocre society. If they choose excellence, they get an excellent society. If they choose decadence, they get a decaying society. It happens every time. Societies are successful when people choose to be good.
People choose to be good when they are taught and believe in good. In order to truly instill goodness into them, they must be taught the truth by everyone around them and involved in their lives. Teaching influences good and betters society.
The thing which determines how well a people is taught is their national book. A national book is a book that almost everyone in the nation accepts, reveres, and believes in. Good national books will lead to good nations, until they reject that book. Bad national books lead to bad nations, until they reject that book.
What of a nation with no national book? Such a nation is without culture, or is in the process of losing it. In the 50's and 60's, it was the Bible and the Declaration of Independence. In the late 60's, nobody believed in a single book - so we had no national book. That changed again in the 80's. It began to be rock and roll. Students would study it daily for many hours and believed in it passionately. Try to tell a group of youth that their music is bad, and see what happens. But even this is only shared by the youth, not everyone, so it's not a national media. So what is our national book today?
There is no national book today. We cannot agree on a book to accept as true! If we cannot establish a national book, we will decline in ignorance. The fact that we are lacking such a book is not attributed to schools, but to the family!  Homes are where we are really taught what we think, not schools. Families have been unraveled by modern concepts, and children are raised, not educated. Families sometimes do activities together, but they don't think together. Parents don't aspire for their children to be wise; instead they want them to get a good job and be 'successful'. Because families are falling apart, the nation is too. Nobody thinks the old books are up to date and have truth. The very idea of a national book is disappearing. People don't think that one book can have all the answers.
If this is true, and it is, then America cannot remain free. We must adopt a good central text. This is imperative to the survival of our nation and culture. We must be based on good, light, and truth. We must regain our freedom.