What makes Wooden's wisdom sting is that it reframes failure as almost forgivable—the real danger isn't stumbling, but stubborn repetition. A student might flunk an exam and recover; she fails irretrievably only if she studies the same way next time. He's not offering the comfortable modern platitude that failure builds character; he's issuing a warning about calcification, about the slow death of people who mistake survival for growth. That's why coaches and therapists return to this line: it cuts through our excuses by pointing out that we're not victims of our mistakes, but potentially architects of our own stagnation.