" Even when we're sitting still, with no external stimuli, an endless internal dialogue may be going on in our head. we're constantly consuming our thoughts. Cows, goats, and buffalo chew their food, swallow it, then regurgitate and rechew it multiple times. We may not be cows or buffalo, but we ruminate just the same on our thoughts - unfortunately, primarily negative thoughts. We eat them, and then we bring them up to chew again and again, like a cow chewing its cud. "

― Thich Nhat Hanh , Silence: The Power of Quiet in a World Full of Noise