@ Philiolioso
It might be a realist's attempt at trying to categorize the difference between behaving internally or externally, but in truth the idea is that changing individual thought patterns changes the world. While there is no solid proof of this, it is clear that the better our value system is, the more human wellness that can be spread. I believe this was the authors message.
In regards to science being able to prove everything, you've forgotten the difference between finite and infinite. We are finite beings, and when we die, we become infinite. There is so much we don't know is the point, and making assumptions defeats growth. Acknowledging the existence of spirit is essential with living a life with moral values and helping others. I'd hope these are the types of questions the author would want us to think about.