As you ruminate or catastrophize, you are getting pulled…
As you ruminate or catastrophize, you are getting pulled into a mental pattern that depletes your energy and vitality. Nothing can demoralize you faster than getting fixated at everything that can go wrong.
— from Fuel (Energy)
In the book
The third is the mind turned against itself. As you ruminate and catastrophize, you are pulled into a mental loop that quietly drains your vitality faster than almost anything else. And even ordinary deciding costs more than we think — self-control and judgment run on a kind of muscle that tires with use, a depletion that makes every later decision worse; the sheer mental energy and stress of deciding what to do, all day long, is a real and rarely-counted cost. — Fuel (Energy)