Christ as the image of God is the effulgence of His glory (Heb. 1:3). Hence, the gospel of Christ is the gospel of His glory that illuminates and shines forth. Satan, the god of this age, has blinded the thoughts and the minds of the unbelievers so that the illumination of the gospel of Christ's glory might not shine into their hearts. This is similar to a camera lens's being covered so that the light cannot shine into the camera to bring in the image. It is also like a blind man, or a man with his eyes veiled, into whom the light of the sun is unable to shine.
