世界的美有两面，一面是欢笑，一面是痛苦，将心切成两半。
The beauty of the world has two edges, one of laughter, one of anguish, cutting the heart asunder.
We don’t inherit the earth from our ancestors; we borrow it from our children.
每一个心理行为都是调整的行为。
最伟大的发明是那些最直接满足人类需求的发明。