Nothing affects life or defines the outlook of life more than thought. Everything one has been, or is going to be, is due to thought. Thought can motivate, and that motivation can bring about a single idea on which hinges the direction of life itself, until the end of ones time on the planet. Or thought can incapacitate with just a single idea, leading to desperation.
Humans are puppets, run by their minds. The only way to live is by gaining control of the mind. Control thought, and voilĂ ! suddenly life is full of possibility. All that then remains to be dealt with, is choice.. which can make life a success or get it undone, because influences abound, and it's all so subjective.
But only knowing the importance of the stakes can enable one to make a sensible choice. Only knowing how ones mind reacts to various situations, can enable that ability. And the luxury of a choice that will not end in regret. Which means, knowing what one wants from life, how one wants to be remembered.. a tall order, when modern life beckons one to 'live free, by the day, let the devil take tomorrow'.
This book guides the mind to logic, so that it's always in ones control, because the body is merely the machine that it is attached to, in every sense, because no one else can exercise that control better.. and no one should ever be allowed to.