The radiance of Christ's glory has power to transform us into His image.
2 Corinthians 3:17-18 NIV
Now the Lord is the Spirit, and where the Spirit of the Lord is, there is freedom. And we all, who with unveiled faces contemplate the Lord's glory, are being transformed into his image with ever-increasing glory, which comes from the Lord, who is the Spirit.
Perhaps, that is why Jesus told Martha that Mary had made the better choice. The sanctification of our hearts and minds is a process as we submit ourselves to see Him and hear Him (i.e., contemplating His glory).
Romans 12:2a
Do not conform to the pattern of this world, but be transformed by the renewing of your mind.
And that is why the enemy tries to keep a veil over the unbelievers' eyes - to keep them from seeing and experiencing the transforming power of the radiance of His glory.
2 Corinthians 4:1, 3-4, 6 NIV
1 Therefore, since through God's mercy we have this ministry, we do not lose heart. ... 3 And even if our gospel is veiled, it is veiled to those who are perishing. 4 The god of this age has blinded the minds of unbelievers, so that they cannot see the light of the gospel that displays the glory of Christ, who is the image of God. ... 6 For God, who said, "Let light shine out of darkness," made his light shine in our hearts to give us the light of the knowledge of God's glory displayed in the face of Christ.
The radiance of God's glory through Christ is lossless (2 Cor 4:4,6 and Heb 1:3):
Hebrews 1:3 NIV
The Son is the radiance of God's glory and the exact representation of his being, ...
And to the extent that we "do not distort the word of God", and we "set forth the truth plainly" (2 Cor 4:2), God's glory radiates through our Gospel message.
So, an analogy/metaphor that Holy Spirit gave me this morning: as physical light (i.e., electromagnetic radiation and nuclear radiation) has energy and momentum (i.e., power to affect/transform what it impacts; e.g., visible or UV light, or alpha, beta, or gamma, etc.), and as the fundamental quantum of electromagnetic radiation energy is the photon, so every time we tell the Gospel message of Jesus's love, we are radiating "photons" of Christ's glory into people's minds by way of their ears. And when we demonstrate His goodness and power through good deeds, we are radiating nuclear radiation by way of their eyes.
And "since through God's mercy we have this ministry" of irradiating the transforming power of Alpha-Omega radiation, "we do not lose heart" because we are fueled by an endless supply of spiritual-nuclear power. And as nuclear radiation causes a chain reaction, so we are making disciples (spiritual-nuclear radiators) of all nations.
Father, you amaze me! You are so good! Please shine your glory through me today! May I be faithful to sit in the radiance of the Son today, and may I faithfully irradiate others. I want to glow with your glory. Holy Spirit, I commit to follow you today. I love you!