B.

“Estar concentrado significa hacer en todo momento lo que sabes que tienes que hacer, no cambiar nunca tu plan, a menos que las circunstancias del peloteo o del juego cambien de un modo tan excepcional que justifiquen la aparición de una sorpresa. Pero en términos generales significa disciplina, significa contenerte cuando surge la tentación de jugártela. Luchar contra esa tentación significa tener la impaciencia o la frustración bajo control.”
― Rafael Nadal, Rafa, mi historia (Indicios no ficción)

“On the abstract level, I have turned the belief in my own fallibility into the cornerstone of an elaborate philosophy. On a personal level, I am a very critical person who looks for defects in myself as well as in others. But, being so critical, I am also quite forgiving. I couldn't recognize my mistakes if I couldn't forgive myself. To others, being wrong is a source of shame; to me, recognizing my mistakes is a source of pride. Once we realize that imperfect understanding is the human condition, there is no shame in being wrong, only in failing to correct our mistakes.”
― George Soros, Soros on Soros: Staying Ahead of the Curve

“Some salesmen think that selling is like eating—to satisfy an existing appetite; but a good salesman is like a good cook—he can create an appetite when the buyer isn't hungry.”
― George Lorimer, Letters from a Self-Made Merchant to His Son

“It's not whether you're right or wrong, but how much money you make when you're right and how much you lose when you're wrong.”
― George Soros