Full Idea
Plato argues that changing things, even if they are somehow real, do not have an essence; but Aristotle argues that changing things have a changeless essence.
Gist of Idea
Plato says changing things have no essence; Aristotle disagrees
Source
report of Aristotle (Metaphysics [c.324 BCE], ess) by Vassilis Politis - Aristotle and the Metaphysics 2.4
Book Reference
Politis,Vasilis: 'Aristotle and the Metaphysics' [Routledge 2004], p.52