How does the concept of original sin relate to justification?

According to Romans 5:12, sin entered the world through one man, Adam, leading to death for all because all have sinned. This doctrine of original sin is foundational in Reformed theology, establishing that every human inherits a sinful nature and stands condemned before God. Understanding original sin highlights the absolute need for justification; without it, humanity would be lost. Justification is essential as it provides the means through which God reconciles sinners to Himself, not based on their merit but entirely through the redeeming work of Christ. The realization of our sinful condition makes the grace of God’s justification all the more precious and necessary for salvation.