I felt the book was going through the same thing over and over again. The simplest tl;dr is that your thoughts affect yoru reality. Even if you strip all the metaphysical stuff, you still have to accept that all the action we take are affected by our thoughts. Mind is at the center of everything we do. Fix the mind and eventually other things in life will fix themselves.
Nurture the individual and world itself will become a better place :)
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