Success is the sum of small efforts repeated day in and day out.
The genius here lies in what Collier refuses to promise: there's no mention of talent, luck, or that one breakthrough moment we all wait for. Instead, he's pointing out something almost mundane—that success is arithmetic, not magic—which ought to be more comforting than it sounds. A student who reviews vocabulary for fifteen minutes every morning will outpace the one cramming before exams, not because she's smarter but because she's chosen the patient path. What makes this bearable is that small efforts are actually within our control, whereas waiting for inspiration or the perfect opportunity leaves us helpless.