Like letting a field lie fallow - seems like a waste of good farming land, but it allows the soil to replenish itself and produce more the next year. Regular rest keeps the soil healthy; overworking the plot drains it of all its resources, leaving it barren. So too with souls (or whatever your preferred terminology; I think it’s fair to call someone’s creativity their “soul”, even though I’m not religious).

I dislike the implication that your goal is always to be creating, or to be productive.