Jesus exchanged our old nature for His nature @ the cross. You can't have "2" natures. Our old nature, our sin nature, was crucified "in Christ" on the cross. Our new nature, or spirit nature, was resurrected with Christ...so that, "if the Spirit of Him who raised Jesus from the dead dwells in you, He who raised Christ Jesus from the dead will also give life to your mortal bodies, or flesh, through His Spirit who dwells in you." Romans 8:11We are new creations...under a new Law. It's the Law of Grace or the Law of the Spirit. You can't live under "2" sets of Law.If our identity, or our being, is our NEW NATURE, then our doing will agree with our being.Reading:Romans 8; James 4:17; Ephesians 5:8-14