When the difference of reality is taken into account, it develops from difference into opposition, and from this into contradiction, so that in the end the sum total of all realities simply becomes absolute contradiction within itself. The law of dialectical logic is contradiction. The whole is not only different from its contradictory moments, but also more than them. It is another, third thing in which opposites are in a systematic relation with each other. Notion is to be regarded in the first instance simply as the third to being and essence , to the immediate and to reflection .
Motion is therefore, contradiction.
Since opposites constitute a unity they are related to each other systematically, that is, systematicity is result of contradiction. Hence, the concepts are in motion. Dialectics can begin only if there is contradiction, motion is always in contradiction. Everything is the result of prime mover and everything is in motion. Unity is the first step of constituting system, for that reason motion is the key to find the opposite of any concepts.