"Books so special and rare and yours that advertising your affection feels like a betrayal."
Don’t wait for opportunities—create them.
真正的友情在困难时才会被考验。
数学不是关于数字、方程、计算或算法的:它是关于理解的。
Man is so naturally good that when he does evil it is against his will.
"Life is not what one lived, but what one remembers and how one remembers it to tell it."
The true test of a mathematical idea is its ability to inspire further questions.