The difference between perseverance and obstinacy is that one comes from a strong will, and the other from a strong won’t.
坚持与固执之间的区别在于一个源自坚强的意志，另一个源自坚强的拒绝。
The only way to learn mathematics is to do mathematics.
"The only way to deal with an unfree world is to become so absolutely free that your very existence is an act of rebellion."
做出伟大工作的唯一方法就是热爱你所做的事情。
Every action has its pleasures and its price.
对死亡的回避是不健康和异常的，它使生命第二阶段失去目标。
个人必须从他的文化提供的材料中塑造自己。