" The rest of the family looked on with a bemusement that, in the case of Rafa’s mother, occasionally gave way to anger. His father, Sebastián, had his misgivings. His uncle Rafael wondered sometimes whether Toni was pushing his nephew too hard. His godfather, his mother’s brother, Juan, went so far as to say that what Toni was doing to the child amounted to “mental cruelty.” But Toni was hard on Rafa because he knew Rafa could take it and would eventually thrive. He would not have applied the same principles, he insists, with a weaker child. The sense that perhaps he might have been right was what stopped the more doubtful members of his family from outright rebellion. One who did not doubt Toni was Miguel Ángel, the professional football player. Another disciple of the endurance principle, in which he believes with almost as much reverence as Toni himself, Miguel Ángel says that success for the elite sportsman rests on the capacity “to suffer,” even to enjoy suffering. “It means learning to accept that if you have to train two hours, you train two hours; if you have to train five, you train five; if you have to repeat an exercise fifty thousand times, you do it. That’s what separates the champions from the merely talented. And it’s all directly related to the winners’ mentality; at the same time as you are demonstrating endurance, your head becomes stronger. "

― Rafael Nadal , Rafa