In this papar I have tried to consider "being" (ον) from the standpoint of ενεργεια and δυναμιζ. In the beginning I will take into consideration that which we experience through our senses. When we explain sensory experience by using the concepts ofενεργεια and δυναμιζ, on the one hand we may consider these concepts in connection with essence, and on the other hand in connection with existence. When "being" is considered as the real thing which actually exists, ενεργεια and δυναμιζ both may mean the real being, too. Moreover, to the extent that that which we experience through our senses is considered in this way, it contains υλη together with ειδοζ in itself, therefore it may be able to change. That is, it means ενεργεια in a sense, and δυναμιζ in, a sense. In this manner we may consider that ενεργεια and δυναμιζ are in the process of a movement which aims at the unchangeable being, and in the process of this movement δυναμιζ is always based on ενεργεια. In this way the movement continues until δυναμιζ and ενεργεια arrive at the ultimate aim. Moreover, the ultimate aim is ενεργεια which never changes. This ενεργεια doesn't contain υλη and therefore isn't considered to be that which is experienced through our senses. Therefore we may conclude that it means the ultimate εν ελεγεια.