I-Ching. The Book Of Change. Perhaps the oldest book written down. Perhaps not.
Regardless, the I-Ching is an excellent text to consider in a "meditation" state. I read it several years ago, and my meditations were different when I thought of it during them. I found myself sitting for hours...
Jensa - a very good topic. My interpretation is that one should not act to upset an equilibrium, or a balance. Where it seems necessary to perform an action, I believe it should be done. However, only when it seems necessary. And, furthermore, the action taken should not be so miniscule, nor so...