{"Conformity to Christ" is to bear} the image of the heavenly, {an image which entails} utter absence of slavery to passion, ignorance of sin, superiority to death and corruption, holiness, justice... These, I think, are possessions that befit the divine undefiled nature...
(The Image of God in Man according to Cyril of Alexandria, p. 66, quoting from Cyril's text, "Adversus Nestorii blasphemias" 3,2)
... if our ideas are sound, we shall not believe that those who have God's image gleaming in their souls by the quality of their way of life bear a likeness to Him which is substantial and unchangeable... {and that} God is like us without any distinction whatsoever. This is not so; far from it. There is an infinite distance between us. We are not simple in nature; but God is utterly simple, without any composition, all-perfect, in need of nothing... {Thus our likeness to God isn't an expression of our essence;} rather does the likeness reveal itself somehow in deed and in the quality of one's way of life.
(The Image of God in Man According to Cyril of Alexandria, p. 47, quoting Cyril's "De sancta et consubstantiali trinitate" deal. 1)