but to make their own. The primary or fundamental movements of the new school of the dance must have within them the seeds from which will evolve all other movements, each in turn to give birth to others in an unending sequence of still higher and greater expression,thoughts,and ideas.

VOA: special.2010.08.29

So, the question is, from an evolutionary standpoint, " "Why would an unconscious evolve?"

那么，从进化的观点来看，要问的问题便是“无意识为何得以进化“

耶鲁公开课 - 心理学导论课程节选