Hebrews warns against turning away from Jesus. It reminds us that in Jesus, we have all we need. Jesus isn't just a new preacher on the scene, He is the finale to the longest story ever told. What God began long ago comes to completion in Jesus.
We are called to fix our faith on Jesus. He alone reveals God to us fully. There's no going back to what we did before or looking for something more or different. Jesus is God in flesh, the way the truth and the life.