What does the Bible say about the necessity of preaching the Gospel for salvation?

The Bible teaches that while the preaching of the Gospel is vital, it does not serve as a legal means of salvation. Salvation is already accomplished in Christ, and the purpose of the Gospel is to bring believers into a fuller experience of that salvation. The preaching of the Gospel helps us to remember and understand the righteousness that comes from Christ alone. This truth emphasizes that our faith is a result of having already been given life by God, and the hearing of the Gospel is necessary for our growth and encouragement in that truth.