"The hardest thing in life is to know which bridge to cross and which to burn."
"The most powerful moments are those without words."
解释:往往在你觉得是轻而易举的时候,困难也就跟着来了。
教育的目的不是使年轻人在任何一门科学上都变得完美,而是要打开和培养他们的思维,使他们在将来学习任何科学时都能胜任。