真相很少是纯粹的，也从来不是简单的。
The truth is rarely pure and never simple.
However difficult life may seem, there is always something you can do and succeed at.
量化金融最重要的教训是，你必须理解模型的局限性。
大胆梦想，努力工作，永远不要让任何人黯淡你的光芒。