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)

“What stands in your way is that you have a much too willful will. You think that what you do not do yourself does not happen.”
― Eugen Herrigel, Zen in the Art of Archery

“Worrying is the one game in which, if you guess right, you don’t get any satisfaction out of your smartness. A busy man has no time to bother with it.”
― George Lorimer, Letters From A Merchant To His Son: Letters From A Self-Made Merchant To His Son Classics, Letters From A Self-Made Merchant To His Son George Horace Lorimer Illustrated and Annotated

“Poverty never spoils a good man, but prosperity often does. It’s easy to stand hard times, because that’s the only thing you can do, but in good times the fool-killer has to do night work.”
― George Lorimer, Letters From A Merchant To His Son: Letters From A Self-Made Merchant To His Son Classics, Letters From A Self-Made Merchant To His Son George Horace Lorimer Illustrated and Annotated