You can’t change the past, but you can shape the future.
A mathematical proof is a poem written in the language of logic.
今天对自由民主最严重的威胁不是来自外部,而是来自内部。
"The role of business is to produce goods and services that people value more highly than their cost, and to do so while consuming as few resources as possible."
质量不是声明;它是一种证据。