Quite unbefitting is an expression like this for heretics, whether they be the sectarians or the teachers. For as Christ Himself said, Darkness has blinded their eyes (Jn 12:40). And this Paul explains to us, saying, that the god of this world hath blinded the minds of them that believe not, that the light of the glorious Gospel of Christ may not shine upon them (2 Cor. 4:4)
... It is our duty, therefore..., to draw near to the true light, even Christ, praising Him in psalms and saying, Lighten mine eye, that I sleep not for death (Ps. 13:3)... Let, therefore, our loins be girt, and our lamps burning, according to what has been spoken unto us (cf. Lk 12:35).
By their loins being girt, He means the readiness of the mind for every good work; and by their lights burning, that their heart be filled with divine light.
(Commentary on the Gospel of St. Luke, pp. 370-371, 210)
Alternative translation of the above passage:
It is when we keep ourselves believing and holy that Christ is obviously formed in us (Gal. 4:19), and His own features flash intelligibly in our minds.
(The Image of God in Man according to Cyril of Alexandria, p. 75, quoting from Cyril's text, "De dogmatum solutione" 3)
Burghardt's commentary on Cyril's passage above: Specifically, the gift of rationality is communicated by the Logos. What does He communicate? Not ideas, but something... a "seed", a "root", "vapors". Whatever it is, through it man participates in the nature of the Logos; it involves, incoatively at least, supernatural life, life above the human.
(The Image of God in Man According to Cyril of Alexandria, pp. 35-36)