The method of psychology must be as exact as the methods of the natural sciences.
心理学的方法必须像自然科学的方法一样精确。
The future of forestry lies in technology, but it must serve nature, not exploit it.
至今一切社会的历史都是阶级斗争的历史。
The most important thing in communication is hearing what isn't said.
The study of mind should be the study of its adaptive functions.