2 Corinthians 4:3-4
And even if our gospel is veiled, it is veiled to those who are perishing. In their case the god of this world has blinded the minds of the unbelievers, to keep them from seeing the light of the gospel of the glory of Christ, who is the image of God.

Evangelism is not a fish on your car, a cross around your neck, or even your testimony--it is proclaiming the Good News about Jesus Christ.
Burk Parsons