When we look at a thing, we must examine its essence and treat its appearance merely as an usher at the threshold, and once we cross the threshold, we must grasp the essence of the thing; this is the only reliable and scientific method of analysis.

• 我们看事情必须要看它的实质，而把它的现象只看作入门的向导，一进了门就要抓住它的实质，这才是可靠的科学的分析方法。