Combinatorics is like the art of counting without actually counting.
The capacity of the human mind for forming and manipulating symbols is what sets us apart from other animals.
艺术的功能不仅仅是告诉你已经知道的东西。
对付一个不自由的世界的唯一方法，就是变得如此绝对自由，以至于你的存在本身就是一种反抗。
要摧毁一种文化，你不必烧书，只要让人们停止阅读它们。
The structure of the international system, not the intentions of individual states, is the primary determinant of state behavior.
True scientific progress requires both creativity and discipline.