Ephesians 2:1 describes the old self as 'dead in trespasses and sins.' Our new self is at peace with God (Romans 5:1) and alive in Christ (Ephesians 2:4-5). Spiritually, in Christ we are alive for the first time.
This newness manifests itself in our spiritual condition, our relationships, and our hearts. We are not cleaned out or covered over we are new. The old has passed away behold, the new has come.' This 'new creation' is the Greek kainos, which means something just made and which is uncommon or novel or unheard of.
The changes we experience as we accept Christ are so radical we are considered 'new.' Second Corinthians 5:17 says, 'Therefore, if anyone is in Christ, he is a new creation.