解释：向外物游览就要要求外物的完备，向自己内心求取，则能充实完善自身。

可持续性不是选择，而是责任。

Virtually no idea is too ridiculous to be accepted, even by very intelligent and highly educated people, if it provides a way for them to feel special and important. Some confuse that feeling with idealism.

书是一个小小的奇迹。