How do we know that we are still sinners as Christians?

Scripture confirms that Christians, although redeemed by grace, continue to grapple with their sinful nature. The Apostle Paul outlines this struggle vividly in Romans 7:15-20, where he describes the conflict between his desire to do good and the presence of sin within him. Furthermore, 1 John 1:8 warns against the denial of sin, stating, 'If we say that we have no sin, we deceive ourselves.' Understanding that Christians are still sinners emphasizes our constant need for Christ's grace and the importance of humility in acknowledging our weaknesses.