And we all, with unveiled face, beholding the glory of the Lord, are being changed into his likeness from one degree of glory to another; for this comes from the Lord who is the Spirit.… For it is the God who said, “Let light shine out of darkness,” who has shone in our hearts to give the light of the knowledge of the glory of God in the face of Christ. (2 Corinthians 3:18; 4:6)

Here we have in a nutshell the whole dynamic Christian mystery, its origin, its goal, and the means to reach it. The uncreated Light of God has made itself perceptible to our human nature in the Incarnation, and our contemplative act of gazing upon God’s glory on the face of Christ results in our being transformed into what we contemplate, namely, the divine nature.
Erasmo Leiva-Merikakis, Fire of Mercy, Heart of the Word: Meditations on the Gospel according to Saint Matthew, Chapters 1–25, vol. 3 (San Francisco: Ignatius Press, 1996–2012), page 42.