Based on Aristotle's definition, all the knowledge was able to be divided into three parts: natural science, metaphysics and mathematics. Among them, we can distinguish between natural science and metaphysics according to whether there exists in reality. And the principle of the limit in mathematics helps us to break the bondage of finite thought. From the quantitative changes of real space to have gone deep into a qualitative difference of ideal realm, it has accomplished the unity of

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... of all knowledge. Take the postulation as an example. This concept corresponds to limiting value, and is a hypothesis that humans can only be continually to modify the one-sided view to approach the truth but can't use empirical methods to prove or disprove it. Newton's First Law is such a postulation, which has invariance or absoluteness, can be called the absolute truth, and belonged to the metaphysical category. According to the above philosophical principles we have found that in Einstein's special relativity there is a paradoxes, which is to use an absolute truth (the principle of constant light velocity in vacuum) to overthrow another absolute truth (the absoluteness of simultaneity) but one of them can't be proved to be false. And his mistake to be found out, which is to confuse the light speed in reality with the c. So, starting from the perspective of all knowledge, all the inertial systems are redefined, Galileo's coordinate transformations once again enabled; and in order to eliminate the false and retain the true, Einstein's two postulations in special relativity are reshaped, which can make them reasonably to return to the framework of absolute space-time. Finally to point out, it has been identified that so-called "Nonbeing" in Lao-tzu is the "metaphysics", which will certainly have great significance to unify the Eastern and Western philosophy.