永远保持节俭，除非是为了自己的热情。
The great secret that all old people share is that you really haven't changed in seventy or eighty years. Your body changes, but you don't change at all.
"We see our customers as invited guests to a party, and we are the hosts."
Mathematics is not just about numbers, equations, computations, or algorithms: it is about understanding.
Nature has been the best bioengineer for billions of years.