In a search for Biblical definitions of the term “gospel” one will next find success in Romans 1:16.
For I am not ashamed of the gospel of Christ: for it is the power of God unto salvation to every one that believeth; to the Jew first, and also to the Greek.
Even though the only words found multiple times in the three gospel explanations are “God” and “believe,” a third word all but visibly joins these words as an established gospel-definition fundamental. That third word is “gospel.”
The first gospel explanation ends “…and believe the gospel.”
The second explanation contains the phrase “salvation to every one that believeth.”
Even though the second explanation does not overtly specify that it is the gospel which is to be believed, we note that the explanation strongly implies this.
Here is the point we are getting at. Even though “God” and “believe” are the only visibly established gospel fundamentals, “gospel” is established to the eager student who reads the second gospel explanation (with the first in mind) and takes a simple interpretive step “not by sight” (2 Corinthians 5:7) – the step of recognizing the implied, second-definition witness of the word “gospel.”
For the student willing to take the interpretive step of faith described above, the established gospel fundamentals in order become
1) God 2) believe 3) the gospel