Theorems are the permanent literature of mathematics.

The past beats inside me like a second heart.

If you're not failing, you're not trying hard enough.

Over the centuries the Indians developed sign language for communicating phenomena of interest. Programmers from different tribes (FORTRAN, LISP, ALGOL, SNOBOL, etc.) could use one that doesn't require them to carry a blackboard on their ponies.

人的本性是天生的质朴；善良是王道教化的结果。