The Life in Jesus is the divine nature of Theos of which constantly beliving one are partakers. The old sinful life is expunged by Grace. Nowhere in the New Testament are believers said to have both the old sin "nature" and the new life in Jesus coexisting together! However, believers may walk according to the flesh (Gk. sarx). But the term "old sin nature" is never used in a coextensive manner with our new life in Christ. The old sin nature is the old anthropology when we were dead in trespasses and sins! The new ontology in Jesus has is not infringed upon by the darkness of the past or this present evil darkness.