Nature Free

Adam sinned and became a fallen deprived creature and then he begat sons in his own fallen likeness. Because of his failure to make the right choice he received the sin nature, which is derived from The devil, John 8:44, Romans 5:12.
This is why the first five dispensations were failures because mankind had a nature that did not fit his creation.
In essence this means that Adam made the wrong choice and was never able to gain his innocence because he now had an inborn sin nature that did not come from God.

Mankind without "christ in you" is incomplete in his creation "And ye are complete in him, which is the head of all principality and power's," Colossians 2:10.
Christ in you is what our father intended for all humans to have resident within them but mankind in general has failed to make the right choice. God created Adam body and soul with a place reserved to house the spirit that was to be later placed in Adam. Adam was an incomplete creation while he was in his innocence. Adam needed a spirit nature in him so that he would be a completed human being.
It was our fathers intention to place "Christ in you" in Adam so that he would be a complete human being, body, soul mind and spirit nature.

Got intended for Christ in you to be Adams nature, the verse: and ye are complete in him, which is the head of all principality and power's, Colossians 2:10.
From the onset God intended for Christ in you to be in every human so that humans would be a complete creation.
Of course you know the story about Adam making the wrong choice while in the garden of Eden where he received the sin nature from the devil. Most definitely Christ in you is what makes the born-again believer complete in his or her creation.

Prior to Paul mankind knew that he had a spirit nature resident within him but he did not know that it was a sin nature until it was revealed to the apostle Paul.
During the millenniums that occurred during these dispensations mankind had to learn how to control the sin nature that was in him. Mankind did not know that obedience to good moral laws, good rules, good regulations, etc. was simply a means of controlling or suppressing the sin nature resident within. This is nothing more than an attempt to be a good person. At this point it is necessary to state that mankind is a tripartite being which means he is body, soul and spirit, 1st Thessalonians 5:23.