A small fish lives in a big pond among many fish, and water is very clear. Most fish are swimming and only taking care of their business, but this small fish doesn't understand anything. "Where is my food? Where is my sleeping place?" If this small fish only went straight, not so much muddied this water, then no problem. But this small fish very frantically checking up and down, left and right, behind, everywhere, so the whole pond becomes dirty. That's this world.
~Zen Master Su Bong