证明是一种用于使他人相信数学陈述为真的工具。
善恶之间的分界线贯穿每个人的内心。
A writer is someone who pays attention to the world.
Walls define space, but openings connect it to the world.
你必须愿意努力工作,并专注于你的目标。
走上绞刑台,迎向行刑的枪口,我自安之如泰。
对抗压力的最大武器是我们选择一种思想而不是另一种思想的能力。
Be brave, take risks, nothing can substitute experience.
The last of human freedoms is the ability to choose one's attitude in any given set of circumstances.