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.
I love playing with the physicality of books - flaps, holes, different sizes.
研究心灵就是研究适应行为；每个思想都是生活的工具。
The value or worth of a man is, as of all other things, his price; that is to say, so much as would be given for the use of his power.
To develop, enterprises must be rooted in real industry and down-to-earth.