There are two natures in a Christian, the old nature you are conceived with and the new nature you receive when you become a Christian. Psalms 51:5 KJV "5 Behold, I was shapen in iniquity; and in sin did my mother conceive me." Ephesians 1:13; 4:30 KJV "1:13 In whom ye also trusted, after that ye heard the word of truth, the gospel of your salvation: in whom also after that ye believed, ye were sealed with that holy Spirit of promise, 4:30 And grieve not the holy Spirit of God, whereby ye are sealed unto the day of redemption." God created man with a three-fold nature. These are the Body, Soul and Spirit. When you are concieved in your mother's womb, you have these three chambers but only two are active, the body and soul. These pertain to your old nature. The spirit chamber is empty and becomes filled with the Holy Spirit when you accept Jesus Christ as your Lord and Savior. Ephesians 1:3 tells that you are sealed with the Spirit until the day of redemption. Great news! Once you are saved you should be now on a mission to behave like a Christian to honor God and testify for him. He gives us grace to account for our failures and setbacks. Paul tells us in Romans 6, we should not purposely sin so grace may abound. God created man with this three-fold nature to teach us more about him. View these charts to augment your study in scripture. View all of the charts from Clarence Larkin at his website. Although he was not an Acts 28 believer, his contribution to dispensational charts is a blessing to have in your library.