Jesus measured spiritual maturity by fruit. And fruit implies seasons. And though we only harvest fruit in one season, we need all four to produce it. Winter is as necessary to bearing fruit—to deep spiritual maturity—as spring or summer is. I think most Christians miss this—and the seasonality of the heart in general—because the idea that darkness, sadness, stillness, and unproductivity might be a necessary condition for bearing fruit collides with our reigning paradigm, the spirituality of busyness and giddiness.