So we are ambassadors for Christ, God making his appeal through us. We beseech you on behalf of Christ, be reconciled to God. For our sake he made him to be sin who knew no sin, so that in him we might become the righteousness of God. Working together with him, then, we entreat you not to accept the grace of God in vain. For he says, "At the acceptable time I have listened to you, and helped you on the day of salvation." Behold, now is the acceptable time; behold, now is the day of salvation.I have added an emphasis to St Paul's urging to the Corinthians (in the second reading at Mass for today) to be true to the grace that they have received because of its echo of a passage from Pope Benedict XVI's message for Lent 2010 (emphasis alsoa added):
So we understand how faith is altogether different from a natural, good-feeling, obvious fact: humility is required to accept that I need Another to free me from “what is mine,” to give me gratuitously “what is His.” This happens especially in the sacraments of Reconciliation and the Eucharist. Thanks to Christ’s action, we may enter into the “greatest” justice, which is that of love (cf. Rm 13, 8-10), the justice that recognises itself in every case more a debtor than a creditor, because it has received more than could ever have been expected. Strengthened by this very experience, the Christian is moved to contribute to creating just societies, where all receive what is necessary to live according to the dignity proper to the human person and where justice is enlivened by love.