The gospel of Jesus Christ is His death, burial and resurrection according to the scriptures. This is often viewed as just the starting point for the Christian life. In truth, it is central to our life in Christ after salvation as well.
Isaiah spoke about the gospel long before the birth of Jesus Christ.
God's people had sinned and He sent fiery serpents among them which bit them. However, God also gave a way of escape to those who would look and live.
The birth of Christ was the beginning of God's great plan for redemption through His Son Jesus Christ.
How is God going to wrap things up in the end?