Teachings of the Prophet Joseph Smith, pg. 264; “Now taking it for granted that the scriptures say what they mean, and mean what they say, we have sufficient grounds to go on and prove from the Bible that the gospel has always been the same, and the officers to officiate, the same; the ordinances to fulfill its requirements, the same, and the signs and fruits resulting from the promises, the same…”
1 Peter 1:25; “But the word of the Lord endureth for ever. And this is the word which by the gospel is preached unto you.”
The meaning of the word “gospel” is “good news”. The good news is that we are saved by grace through faith and not works.