THE RADIANCE OF GOD
Glow-in-the-dark objects contain special substances called phosphors. Phosphors give off visible light after being energized. This means they have to soak in the light before they will glow in the dark.
"And we, who with unveiled faces all reflect the glory of the Lord, are being transformed into his image with intensifying glory, which comes from the Lord, who is the Spirit." 2 Corinthians 3:18
When Moses came down from meeting with the Lord on Mount Sinai, he was not aware that his face was brilliantly radiant. The people were afraid and ask him to wear a veil to cover the glow. Yet he removed the veil whenever he met with the Lord.
When we turn to the Lord, the veil of our worldly concerns is taken away, and we begin to glow from exposure to his love and freedom.