The past is never really past; it lingers in the corners of our lives.
过去从未真正过去，它徘徊在我们生活的角落。
Complexity and contradiction are not problems to be solved, but opportunities to be explored.
The joy of discovery in mathematics is like solving a puzzle that the universe has left for us.
孔子说：“君子有九种事情要考虑：看要考虑是否看清楚了、听要考虑是否听清楚了、脸色要考虑是否温和、表情要考虑是否谦恭、言谈时要考虑是否忠诚、工作时要考虑是否敬业、疑问时要考虑请教、愤怒时要考虑后患、见到好处时要考虑道义。”
The best investment is in education.