if you stop believing that you can reach a…
if you stop believing that you can reach a goal, either because you've regressed or you've plateaued, don't quit. Make an agreement with yourself that you will do what it takes to get back to where you were or to get beyond the plateau, and then you can quit. You probably won't.
— from Expanding Your Range (Growth/Change/Education/Learning/Habit) · Peak: Secrets from the New Science of Expertise by Ansers Ericsson and Robert Pool