'Gospel' in the Bible

Furthermore, when I came to Troas to preach Christ's gospel, and a door was opened unto me of the Lord,

But if our gospel be hid, it is hid to them that are lost:

In whom the god of this world hath blinded the minds of them which believe not, lest the light of the glorious gospel of Christ, who is the image of God, should shine unto them.

And we have sent with him the brother, whose praise is in the gospel throughout all the churches;

Whiles by the experiment of this ministration they glorify God for your professed subjection unto the gospel of Christ, and for your liberal distribution unto them, and unto all men;

For we stretch not ourselves beyond our measure, as though we reached not unto you: for we are come as far as to you also in preaching the gospel of Christ:

To preach the gospel in the regions beyond you, and not to boast in another man's line of things made ready to our hand.

For if he that cometh preacheth another Jesus, whom we have not preached, or if ye receive another spirit, which ye have not received, or another gospel, which ye have not accepted, ye might well bear with him.

Have I committed an offence in abasing myself that ye might be exalted, because I have preached to you the gospel of God freely?