Indeed, the best way to think of willpower is not as some shapeless behavioral trait but as a sort of psychic muscle, one that can atrophy or grow stronger depending on how it's used. — Jeffrey Kluger Copy Share Image
For decades I'd flit from drawing table to typewriter to guitar with no sense of strain or contradiction. They all exercised the same psychic muscle (the Imagination), and working in one medium refreshed my appetite for the others. — Peter Blegvad Copy Share Image
