What does washing robes in the blood of the Lamb mean?

In Revelation 7:14, the phrase 'washed their robes and made them white in the blood of the Lamb' signifies the profound truth of salvation by grace through faith in Christ. This imagery reflects the transformative power of Christ's sacrifice, which cleanses believers from sin. While it may seem paradoxical to wash robes in blood, it illustrates that faith in Christ's atoning work is what makes a person righteous before God. The concept emphasizes that salvation is entirely reliant on the work of Christ, and the act of believing is where the believer's active response comes into play. Therefore, washing robes is symbolic of placing one’s trust fully in Christ, recognizing that our righteousness before God is entirely due to His redemptive work.