The great book for you is the book that has the most to say to you at the moment when you are reading. I do not mean the book that is most instructive, but the book that feeds your spirit. And that depends on your age, your experience, your psychological and spiritual need.
The great men of power who seek to change the nations they belong to usually are pretty terrible people.
You can teach all the other stuff, you know. You can teach shooting the ball, you can teach having a good touch... passing and whatnot, but when you get out there on the field, it's just a mindset you need to go into the game with.