Mathematics is not a spectator sport.
"Books are the quietest and most constant of friends; they are the most accessible and wisest of counselors, and the most patient of teachers."
真理是一种发生在观念上的东西。
对心灵的研究必须是纯粹分析性的。
Life is like a cup of tea, it won't be bitter forever, but it will be bitter for a while.