But ye are a chosen generation, a royal priesthood, an holy nation, a peculiar people; that ye should shew forth the praises of him who hath called you out of darkness into his marvellous light. (1 Peter 2:9)
A literal interpretation of our opening verse would mean that the new creation is one who is called out of darkness into God's marvelous light, meaning he had a past of darkness. This, however, isn't true, because the new creation never existed before, and therefore couldn't have a past. He has a new life.
The idea of the new creation having a past is mostly common amongst believers who merely see the Christian as "a sinner saved by grace"; one who was once under the power of Satan, but now free to serve God. However, as you grow in the knowledge of the Word of God, you'll discover that being born again, you're not the one who was taken from the hands of Satan and delivered into the hands of God; you're actually a new creation. You're not the man that was in darkness; that man actually died in Christ. You were born into His marvelous light.
Acts 13:33 tells us something beautiful; it reads,
God hath fulfilled the same unto us their children that he hath raised up Jesus again; as it is also written in the second psalm, Thou art my Son, this day have I begotten thee.
God didn't say, "Thou art my Song, this day have I raised thee back to life" no; rather, He said, "This day, I have given birth to you (begotten thee)." When Jesus died, He died in the spirit; that's why He's called the first begotten from the dead (Revelation 1:5), not the first to be raised from the dead. When He was raised from the dead, He was raised as a new creation.
2 Corinthians 5:17 says,
(2 Corinthians 5:17)
...if any man be in Christ, he is a new creature...
You're a new species-- recreated in Christ Jesus and brought into a newness of life:
Therefore we are buried with him by baptism into death: that like as Christ was raised up from the dead by the glory of the Father, even so we also should walk in newness of life.
My life is one of glory and excellence, because I'm a new creation in Christ Jesus! I walk in the glory of God, having been born into a newness of life. I live in the immeasurable and unlimited grace and mercies of God. Hallelujah!
Further Study: 1 John 5:11-12; Colossians 3:9-10