司马牛忧伤地说:“别人都有兄弟,唯独我没有。”子夏说:“我听说过:‘死生有命,富贵在天’。君子敬业而不犯错误,对人恭敬而有礼。四海之内,皆兄弟。君子担心什么没有兄弟?”
Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.
数学家研究纯数学不是因为它有用;他研究它是因为他喜欢它,他喜欢它是因为它美丽。
The improvement of understanding is for two ends: first, our own increase of knowledge; secondly, to enable us to deliver that knowledge to others.