组合数学是不用计数的计数艺术。
Combinatorics is the art of counting without counting.
"A man’s work is nothing but this slow trek to rediscover, through the detours of art, those two or three great and simple images in whose presence his heart first opened."
感官训练可以培养敏锐的观察者，适应现在的文明时代，更能实际地应用于日常生活中。
心理学家必须避免一切目的论的解释。
Intelligence is the ability to adapt to change.
书籍是最安静、最恒久的朋友；它们是最易接近、最睿智的顾问，也是最耐心的老师。
世界上充满了神奇的事物，耐心地等待着我们的感官变得更加敏锐。