"First Principles “We all, with unveiled face reflecting as a mirror the glory of the Lord, are transformed into the same image from glory to glory.” Chapter 1—Source and Aim of True Education Ed 13 “The knowledge of the holy is understanding; “Acquaint now thyself with Him.” Our ideas of education take too narrow and too low a range. There is need of a broader scope, a higher aim. True education means more than the pursual of a certain course of study. It means more than a preparation for the life that now is. It has to do with the whole being, and with the whole period of existence possible to man. It is the harmonious development of the physical, the mental, and the spiritual powers. It prepares the student for the joy of service in this world and for the higher joy of wider service in the world to come. Ed 11"
"But we all, with open face beholding as in a glass the glory of the Lord, are changed into the same image from glory to glory, even as by the Spirit of the Lord."
EGW directly quotes 2 Corinthians 3:18 and uses it as a basis for discussing transformation and reflecting God's glory, making it a clear and intentional allusion.