Those who read books cannot understand the teachings and, what's more, may even go astray. But those who try to observe the things going on in the mind, and always take that which is true in their own minds as their standard, never get muddled. They are able to comprehend suffering, and ultimately will understand Dharma. Then, they will understand the books they read.
The entire cosmos is a cooperative. The sun, the moon, and the stars live together as a cooperative. The same is true for humans and animals, trees, and the Earth. When we realize that the world is a mutual, interdependent, cooperative enterprise -- then we can build a noble environment. If our lives are not based on this truth, then we shall perish.