失敗は成功の母であるが、それを認める勇気がなければ何も生まれない。
失败是成功之母，但如果没有承认它的勇气，就什么也不会产生。
始终使用止损单。
The most profound ideas in mathematics often arise from the simplest observations.
The key to solving complex problems is to break them down into smaller, more manageable parts.
Nothing is more surprising than the easiness with which the many are governed by the few.