'Gospel' in the Bible

Now when I arrived in Troas to proclaim the gospel of Christ, even though the Lord had opened a door of opportunity for me,

But even if our gospel is veiled, it is veiled only to those who are perishing,

among whom the god of this age has blinded the minds of those who do not believe so they would not see the light of the glorious gospel of Christ, who is the image of God.

And we are sending along with him the brother who is praised by all the churches for his work in spreading the gospel.

Through the evidence of this service they will glorify God because of your obedience to your confession in the gospel of Christ and the generosity of your sharing with them and with everyone.

For we were not overextending ourselves, as though we did not reach as far as you, because we were the first to reach as far as you with the gospel about Christ.

so that we may preach the gospel in the regions that lie beyond you, and not boast of work already done in another person's area.

For if someone comes and proclaims another Jesus different from the one we proclaimed, or if you receive a different spirit than the one you received, or a different gospel than the one you accepted, you put up with it well enough!

Or did I commit a sin by humbling myself so that you could be exalted, because I proclaimed the gospel of God to you free of charge?