Having areas in our lives where we can click into auto pilot mode can help us consave, conserve our limited mental energy for the things that really matter. We only have so much to spend each day, and how we choose to spend it matters. Every time in your life that you engage in a repetative thought or a fearful thought or an unhealthy thought, you strengthened the noral circuits that made that thought possible. But you can roll that back every time you replace one of those thought patterns with somethingi a little more helpful to your poor, overtaxed mind.