“Therefore if any man be in Christ, he is a new creature: old things are passed away; behold, all things are become new.” 2nd Corinthians 5:17
The word creature is the Greek word ktisis. It is the same word used to describe the creation of the world. When God created the universe, He didn’t use existing materials or old elements to make it. Everything in creation was newly made. That same word is used here to describe what happened to you the day you got saved. Everything about you is new! You are not an amended, corrected, improved version of what you used to be. You are an absolutely brand-new creation! You are completely detached from the person you once were before Christ.
Adapted, Sparkling Gems From the Greek Vol. 1, Rick Renner