Eternal life also known as Zoe is the God kind of life. This life only is in Christ. John.5.39 – Search the scriptures; for in them ye think ye have eternal life: and they are they which testify of me. So when we read the scriptures they must refer us to Christ and in him we obtain eternal life. Now from the old covenant this life was never mentioned. It seemed as if God would physically punish people for their wrong doing. The blessings mentioned again appears to be of physical gain more than spiritual. Example includes when that woman caught in the act of adultery her penalty was death which was physical.
Another example is that thief at the cross. According to the law, he was crucified. But Jesus said to the very same men today you be with me in paradise. The life that Christ came with is the light of men. If any one has light s/he will not stumble. In other words, when one has life he will not stumble. Only they who have Christ have this life and they will not stumble. The promise of God in Christ Jesus is eternal life. It is not obtained based on works but through faith. John 3:16 says for God so.loved the world that he gave his only begotten son that whosoever that believes will not perish but have eternal life. So the passport to eternal life is faith in Jesus as Christ.