技术并不重要。重要的是你对人有信心，认为他们本质上是善良和聪明的，如果你给他们工具，他们会做出美妙的事情。
The great secret that all old people share is that you really haven't changed in seventy or eighty years. Your body changes, but you don't change at all. And that, of course, causes great confusion.
不要担心你在数学上遇到的困难；我敢保证我遇到的困难比你还大得多。
君子有九种事情需要考虑到：看，要考虑是否清楚；听，要考虑是否明确；脸色，要考虑是否温和；容貌，要考虑是否恭敬；言语，要考虑是否忠实；做事，要考虑是否认真；疑惑，要考虑是否求教；愤怒，要考虑是否有后患；利益当前，要考虑是否该伸手。