在数学中，发现的旅程和目的地一样重要。
物种之间的边界比我们想象的更具渗透性。
The truth is rarely pure and never simple.
Life has become richer by the love that has been lost。
The world is indeed full of peril, and in it there are many dark places; but still there is much that is fair, and though in all lands love is now mingled with grief, it grows perhaps the greater.