"Tennis has given me everything, and I want to give something back."
免费的疫苗比昂贵的治疗更有价值，但更难推广。
Truth is so hard to tell， it sometimes needs fiction to make it plausible.
"Sometimes I think that the only thing that connects us to the past is the present. Without the present, the past would be lost forever."
Never confuse a single defeat with a final defeat.
童话故事比真实更真实：不是因为它们告诉我们龙存在，而是因为它们告诉我们龙是可以被打败的。
Greatness is not a skill, it's an attitude.
Money and success don't change people; they merely amplify what is already there.