"In the end, we will remember not the words of our enemies, but the silence of our friends."

数学的本质不仅在于解决问题，还在于提出正确的问题。

缺乏一个强大的国家对自由的威胁比存在一个强大的国家更大。

Then it was that Margaret, sitting alone with tears dropping often on her work, felt how rich she had been in things more precious than any luxuries money could buy—in love, protection, peace, and health, the real blessings of life.