In this verse, Paul emphasizes the concept of justification, which means being declared righteous in the sight of God. This justification is not something that can be achieved through human efforts or adherence to the law. Instead, it is a gift that is freely given by God's grace. Grace, in Christian theology, refers to the unmerited favor of God towards humanity. This grace is made manifest through the redemption that Jesus Christ provides. Redemption involves being bought back or liberated from the bondage of sin, and it is achieved through the sacrificial death and resurrection of Jesus.
The verse underscores a fundamental Christian doctrine: salvation is a divine gift, not a human achievement. It is available to all people, regardless of their background or past actions, because it is grounded in God's love and mercy. This message is central to the Christian faith, offering hope and assurance that anyone can be reconciled to God through faith in Jesus Christ. The verse calls believers to embrace this gift of grace and live in the freedom and righteousness it brings.