Why does Paul stress that justification comes through faith?

Paul emphasizes the necessity of faith for justification to articulate the nature of salvation as a gift of grace. He explains in Romans 4 that if justification could be obtained through the law or works, it would undermine grace and make faith unnecessary. The focus on faith highlights that all individuals, regardless of their background or adherence to the law, can obtain God's righteousness through belief in Jesus Christ. This emphasis fosters humility and reliance on God's mercy, recognizing that salvation is not earned but is freely given to those who believe. Paul's assurance that justification is by faith underscores the sufficiency of Christ's work on the cross, affirming that it is only through faith that we can be reconciled to God.