In itself it cannot be conceived for in that case it would necessarily be conceived as something determinate. It can be conceived only by means of the act to which it is ordered. How did Aristotle arrive at this idea of the reality of the potential. But for one bein g to become another being, it must both actually be what it is, and have the real potentiality to become other that what it is. Without understanding the reality of the potentiality in all that changes, change becomes inconceivable.
Nothing can become w hat it actually is.
If actuality exhaust the totality of real being, then change, or becoming, is impossible. He holds that this concept has objective validity and is the basic concept prior to all other concepts. He also accepts the testimony of the senses as these powers tell a person of the reality of change, or becoming. A being both is what it is, and acts i n accord with what it is. In the order if Being, what a thing is precedes and determines what a thing does, but in the order of our knowledge, what a thing does, is prior to what a thing is.