Time and space are both absolute and relative, and they are dialectical unity of absolute and relative. They are embodied in the dialectical unity of infinity and finiteness. The infinity of time and space means that the whole material world has no beginning or end in time and no end in space. The finiteness of the two means that every specific thing is limited in time and space, and every specific thing has a beginning and an end in time and a boundary in space. Infinity is not beyond finiteness, but exists in finiteness. Therefore, we can only grasp infinity through finiteness.

This is the dialectical unity of infinity and finiteness of time and space.