How do we know mercy is needed for salvation?

Mercy is fundamental to understanding salvation in the Christian faith. As encapsulated in Romans 3:23, all have sinned and are in desperate need of divine mercy. Without recognizing our need for mercy, we cannot appreciate the extent of God's grace as demonstrated through Jesus Christ's sacrificial death. David's acknowledgment of his sin in Psalm 51 illustrates this need, revealing that true repentance begins with the recognition of being a sinner who requires mercy. Thus, acknowledging our inability to achieve righteousness on our own leads us to rely wholly on God's mercy for our salvation.