The real sting of this observation lies not in celebrating defeat, but in admitting that victory often blinds us—we stop questioning what worked because we're too busy enjoying it. Losing, by contrast, demands an accounting; it forces you to examine your assumptions, your preparation, your character under pressure. A tennis player who wins by exploiting an opponent's weakness learns almost nothing, but one who loses to that same weakness must either eliminate it or accept future defeat. That's why the best performers tend to be voracious students of their own failures, while average ones grow comfortable repeating what's just good enough.