事物的矛盾法则，即对立统一的法则，是哲学家们历来所关注的。古希腊罗马对立统一的 理论是从直接的观察和体验得来的，具有直观、朴素的性质，而且也缺乏科学的论证。近代 哲学家以当时的自然科学为依据，论述了一些对立面的思想，然而这一线曙光被消失在形而 上学的浓雾之中 The law of contradiction of things, that is, the law of unity of opposites, has always been the concern of philosophers. Ancient Greece and Rome, the theory of the unity of opposites is derived from direct observation and experience, with an intuitive, simple nature, but also the lack of scientific argument. The modern philosophers, based on the then natural sciences, discussed some of the opposite ideas, but the dawn of the light was vanished from the metaphysical fog