How do we know that Paul represents the experience of a godly person?

The Apostle Paul, throughout his letters, speaks autobiographically about his experience with sin. Particularly in Romans 7, he presents a vivid picture of the internal conflict between his new nature and his remaining sinful flesh. Paul describes himself as 'carnal, sold under sin' (Romans 7:14) and genuinely acknowledges the continuous presence of sin within him. The Puritans and many other theologians have interpreted this struggle as emblematic of the godly person's experience, highlighting that true believers are aware of their sinfulness and are continually in need of Christ’s grace for both justification and sanctification. This struggle is not merely academic but represents a lived reality for Christians who long to serve God but feel the pull of indwelling sin.