Why is trusting in Christ's righteousness necessary?

Trusting in Christ's righteousness is essential to the Reformed understanding of salvation. The sermon illustrates that personal righteousness is unproven and futile, akin to the untested armor that David rejected. Scripture indicates in Romans 3:10 that there is none righteous, emphasizing humanity's need for an external righteousness—one that comes from faith in Jesus Christ. By relying on Christ's righteousness, believers are equipped to stand firm against spiritual assaults and ultimately secure their salvation. This reliance is not merely a theological position but a transformative act that changes how a believer lives and engages with the world.