The world is eternal in physics, but the world has the beginning of time in christianity. Boethius asserts that the world is eternal, and also that the world has the beginning ― The first one is based on the principle of physics, and the second one is on the principle of the highest. That is, they don't contradict each other but belong to a different dimension. From this view, He argues that a physician should insist on his theory's adequacy according to the verification of his own academic domain, and this, not real, but hypothetical theory can recognize realties rightly. However, a scientific theory, which has a hypothetical necessity, if it contrasts to a revelation, cannot get the proper recognition toward realities. If there is a proposition that is applied properly to the reality, it has a real necessity and could not contradict to revelation. Therefore, for an argument based on physics that the world is eternal to be applied rightly to the reality, it must obtain a real necessity, that means, could not contradict to revelation. In physics, for an object to move, it depends on another object, which in turn depends on another one again and again. Also, for the infinite regress is not possible, the existence of the first mover is required, which is non-physical. Consequently an object depends on another object and does not depend on another object. The fact that the first mover is non-physical leads to this problem. At this point, the question ― is the eternity of the world logically inevitable ― occurs. Both the reason of science and the faith of revelation cannot be separated but should be synthesized. Only to argue that each belongs to its own category and not to consider whether they are compatible is not enough. Now, on this time of faith- threatened-by-science-era, we must show that each belongs its own dimesion and also verify that they are one truth, which are compatible.