The first man who， having fenced in a piece of land， said 'This is mine，' and found people naïve enough to believe him， that man was the true founder of civil society.
The most pleasing of all sounds, that of your own praise.
数学不仅仅是关于数字、方程、计算或算法：它是关于理解的。
写作没有规则，只有工具。