How do we know faith is the only evidence of salvation?

Faith is the only true evidence of salvation because, as Paul teaches in Romans, salvation is based entirely on belief in Christ's completed work rather than on human effort. Works can be misleading as a measure of salvation since they can lead to self-righteousness. Romans 3:20 states, 'by the deeds of the law there shall no flesh be justified,' affirming that no amount of works can validate our standing before God. True faith, as defined in Hebrews 11:1, is the assurance of things hoped for and the conviction of things not seen. It is a gift from God, given to His elect, which leads to genuine confidence in Christ’s redemptive work, distinguishing it from works of the flesh.