知足常乐人安乐，无欲无求心轻松。
释义：知足常乐的人会感到快乐，没有欲望没有追求的人会感到轻松。
The improvement of understanding is for two ends: first, our own increase of knowledge; secondly, to enable us to deliver that knowledge to others.
Every character in a novel is a kind of experiment in human nature.
每一本书都是通往另一个世界的门。