My Jesus and my Gospel are capitalized; but to answer your question, the life, teachings, and results of Jesus the Christ. If that is not enough for you, then feel free to wander along the byways of men, as the Reformation does.
I do not care if YOUR gospel is capitalized.. what was the gospel that Jesus said He preached??
Mat 11:5 The blind receive their sight, and the lame walk, the lepers are cleansed, and the deaf hear, the dead are raised up, and the poor have the gospel preached to them.
Mar 8:35 For whosoever will save his life shall lose it; but whosoever shall lose his life for my sake and the gospel's, the same shall save it.
What was jesus preaching to them ?