" When you evolve a thinking creature, you evolve a creature that will think about all sorts of things, including its place in the universe (too low), its path (too hard), its accomplishments (too few), its hopes (too dashed), and its day (both too busy and too empty at the same time). It will think all sorts of things—including a bevy of unreasonable, reasonable thoughts. A thinking creature that is not provided with an off switch or with a simple cognitive regulator will just think on, turning itself into more of a brooding machine than a thinking machine "

― Eric Maisel , Why Smart People Hurt: A Guide for the Bright, the Sensitive, and the Creative