Twilight Sparkle was the personal student of Princess Celestia of Canterlot, a much more important job than the name suggests. What follows is the famous book on politics that Sparkle gifted to her ruler at the time. It's one of the classical and till read writings about statesmanship. Free of religious biases Sparkle advises the ruler ('Princess') about how to remain in power. She does this by use of contemporary and ancient examples to illustrate the right and wrong use of her advises, wich are partly amoral and don't seem to be free of a big dose of cynicism. Sparkle wrote this book with a political focus, but it has become a philosophical analysis of the concept of power.