'Gospel' in the Bible

because of the [confident] hope [of experiencing that] which is reserved and waiting for you in heaven. You previously heard of this hope in the message of truth, the gospel [regarding salvation]

which has come to you. Indeed, just as in the whole world the gospel is constantly bearing fruit and spreading [by God’s power], just as it has been doing among you ever since the day you first heard of it and understood the grace of God in truth [becoming thoroughly and deeply acquainted with it].

[and He will do this] if you continue in the faith, well-grounded and steadfast, and not shifting away from the [confident] hope [that is a result] of the gospel that you have heard, which was proclaimed in all creation under heaven, and of which [gospel] I, Paul, was made a minister.

At the same time pray for us, too, that God will open a door [of opportunity] to us for the word, to proclaim the mystery of Christ, for which I have been imprisoned;