All 7 Uses

gospel
in
Letter from a Birmingham Jail
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I compelled to carry the gospel of freedom beyond my own home town.
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gospel = a set of beliefs firmly held by a group
They will be the young high school and college students, the young ministers of the gospel and a host of their elders, courageously and nonviolently sitting in at lunch counters and willingly going to jail for conscience' sake.
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gospel = the religious teachings of Jesus
Just as the prophets of the eighth century B.C. left their villages and carried their "thus saith the Lord" far beyond the boundaries of their home towns, and just as the Apostle Paul left his village of Tarsus and carried the gospel of Jesus Christ to the far corners of the Greco Roman world, so am I compelled to carry the gospel of freedom beyond my own home town.†
Was not Paul an extremist for the Christian gospel: "I bear in my body the marks of the Lord Jesus."†
I say this as a minister of the gospel, who loves the church; who was nurtured in its bosom; who has been sustained by its spiritual blessings and who will remain true to it as long as the cord of life shall lengthen.†
In the midst of a mighty struggle to rid our nation of racial and economic injustice, I have heard many ministers say: "Those are social issues, with which the gospel has no real concern."†
Their witness has been the spiritual salt that has preserved the true meaning of the gospel in these troubled times.†

Definitions:

(1) (gospel as in: gospel of the Bible)
the religious teachings of Jesus

or:

one of the four books in the New Testament (Matthew, Mark, Luke, and John) that Christian's believe tell the story of Jesus Christ's life and teachings
(2) (gospel as in: they consider it gospel)
a set of beliefs firmly held by a group

or:

an unquestionable truth
(3) (gospel as in: gospel music)
a type of vocal music that originated in African-American churches in the United States
(4) (meaning too rare to warrant focus)