Through the life, death and resurrection of Jesus, God in the flesh, the barrier between God and us has been removed. However this is only the beginning. Jesus not only just removed the guilt of sin, but He also gives us new life. He redirects our rebelling hearts back toward the Father. Jesus gives us a God-ward focused life. We are born again.
There are four dangers of a diminished view of this power of Jesus found in John 3. There is the danger of evaluating Jesus, the danger of underestimating Jesus, the danger of adding to Jesus and the danger of not responding to Jesus.
When we reject the true life that emanates from the Living God, we are only left with death. Jesus came so that we would respond in faith to Him and be transferred from the kingdom of darkness and death to the kingdom of light and life.