The best way to learn mathematics is to do mathematics.

Some programming languages manage to absorb change, but withstand progress.

Travel changes you. As you move through this life and this world you change things slightly， you leave marks behind， however small. And in return， life—and travel—leaves marks on you.

翻译：收藏财物不慎，等于招来盗贼；打扮妖艳，等于引来淫邪。