If the Good News we preach is veiled from anyone, it is a sign that they are perishing.
Satan, the god of this evil world, has blinded the minds of those who don't believe, so they are unable to see the glorious light of the Good News that is shining upon them. They don't understand the message we preach about the glory of Christ, who is the exact likeness of God.
We don't go around preaching about ourselves; we preach Christ Jesus, the Lord. All we say about ourselves is that we are your servants because of what Jesus has done for us.
For God, who said, "Let there be light in the darkness," has made us understand that this light is the brightness of the glory of God that is seen in the face of Jesus Christ.