For she is a vapour of the power of God, and a certain pure emanation of the glory of the almighty God: and therefore no defiled thing cometh into her.

“Because the Father is eternal, the Son is eternal, since he is light from light. If there is a parent, there is also a Son. If there were not a son, how, and of whom, would there be a parent? But both exist, and exist always. Since God is light, Christ is radiance. Since the spirit exists (in fact, "God is spirit"), by analogy Christ is called emanation. Indeed, "he is an emanation of the power of God."”

“Glory. As St. Paul testifies of Jesus Christ, Hebrews i. 3. (Eusebius; Demon. Evang. iv. 5.) — It may also be understood of the wisdom given to the prophets and saints, ver. 27. Plato thought this to be a vapour, or fire proceeding from God. (In Protag. Philo. de Som.) — Some apply the passage to the blessed Virgin [Mary]. (Cornelius a Lapide, v. 26.) (Calmet) See Proverbs i. 2. (Worthington)”