How do we know the doctrine of sin as a disease is true?

The doctrine of sin as a disease is reinforced by both biblical text and the lived experience of believers. Paul encapsulates this reality in Romans 7, where he describes the internal conflict between his new nature and the persistent presence of sin. He speaks of sin as dwelling within him, painting it as a foreign invader that brings him into captivity. This experience resonates deeply with believers who recognize their struggle against sin and the longing for deliverance, underscoring the truth that sin acts like a disease, leading to spiritual sickness that requires healing from the Great Physician, Jesus Christ. Moreover, the gospel offers insight into this healing, affirming that through faith in Christ and His atoning work, believers are spiritually healed from the disease of sin.