I would think of it more like a form of energy, techniques like visualization ask you to see it inside yourself, and rather than force it, simply watch it happen. It's a strong form of energy that flows freely, inside and out. It's always there, indestructible, and called by many things. Some even argue it's what created the world if you're willing to go that far. Now, if it helps you, my teacher told me to think of it best as the Force from Star Wars. Though it's affect is much less visible with the physical eyes.
In other words, use a magic book