What does the Bible say about the certainty of the gospel?

The gospel is described in Luke 1:1-4 as a declaration of those things most surely believed among us. When Luke wrote this, he emphasized the nature of the gospel as not open for debate; it is based on indisputable facts about the life, death, and resurrection of Jesus Christ. The certainty of these truths comes from the eyewitness accounts of those who witnessed Jesus' ministry firsthand and conveyed to us the reality of our salvation. It is not a matter of personal opinion; it is a matter of faith founded on historical events and divine revelation.