Motivation is weather: changeable, unpredictable, often absent when you need it most. You can’t build a life on it. Discipline is climate: the steady, reliable conditions you create for yourself regardless of how you feel on any given day. The most prolific writers don’t write when they’re inspired; they write until they’re inspired. The most successful engineers don’t solve problems when they feel brilliant; they sit with the problem, patiently, methodically, until a solution reveals itself.