How do we know that the two natures doctrine is true?

The doctrine of the two natures is grounded in Scripture, particularly in passages such as Romans 7 and 1 John 3, where the conflict between the flesh and the spirit is articulated. Throughout the lives of biblical figures, such as Paul and Peter, we see examples of this struggle manifested in their actions. The historical testimony of believers further affirms this truth, illustrating a consistent pattern of struggle and victory that resonates with those who have experienced regeneration. By recognizing the duality of their existence, Christians find encouragement and a more profound understanding of God's grace and the nature of salvation.