Your mind is like a muscle: If you don’t train it, it will only become weaker. So in the same way you diligently train your body to perform at its best, you need to train your mental muscle so it will perform at its best too.
Anyone can quit. Many do. But to keep going when others do not, to be able to dig deep and push to the finish line, that is what gives winners an edge beyond talent. And while you may not realize it, you too have the power to develop the mental traits that successful people possess.