I. The Two of you
A. When you are born you are born into Adam
1 Corinthians 15:21-22 So you see, just as death came into the world through a man, now the resurrection from the dead has begun through another man. 22 Just as everyone dies because we all belong to Adam, everyone who belongs to Christ will be given new life.
The bible also refers to this nature as the flesh. It is your inner desire toward sin. The natural propensity to sin.
B. The new nature is given to you the moment you accept Christ
The new nature is new life and new power
It is not your conscience; your conscience is a mental and emotional thing and can be manipulated, seared and affected by circumstances and belief systems.
One of the most crucial aspects of growth in our lives is learning to trust God concerning our two natures.