One gift

Hence, the obligation now incumbent on believers is not to “gain” grace (or salvation), nor to win another installment of grace. There is a single χάρισμα of eternal life ([Rom] 6:23) that runs from the Christ-event to eternity (cf. 8:32), not a series of “graces” won by increases in sanctification. Paul certainly expects that the moral incongruity at the start of the Christian life will be reduced over time, as the believers’ slavery to righteousness draws them toward holiness (6:19). In that sense, what began as a morally incongruous gift will be completed as a morally congruous gift.—J. M. G. Barclay, Paul and the Gift, 517–18