How does Christ's blood justify believers?

Believers are justified by Christ's blood through the mechanism of imputation, where their sins are transferred to Christ, and His perfect righteousness is credited to them. Galatians 2:20 explains this transformative reality: 'I am crucified with Christ: nevertheless I live; yet not I, but Christ liveth in me.' Justification is not merely a legal declaration; it entails spiritual rebirth where believers become united with Christ. This unity not only credits believers with His righteousness but also equips them to live according to His will, acknowledging that their acceptance before God is wholly reliant on His sacrificial work. Understanding this concept propels believers to live in light of grace, free from the burden of striving for righteousness through their efforts.