Finally, if I do not act in a way proper to a child of God, if I do not will in conformity to and in response to the divine will of my Father, I cannot retain my adoption. That is, if I reject the gift of Charity, which as we have seen involves the keeping of the moral law, I cannot be saved. If you look carefully at the above, you will find that the three theological virtues, faith, hope, and charity, correspond perfectly to the three aspects of Pauline faith. And this is not at all surprising, because St. Paul, as has the Catholic Church for 19 centuries after him, read the Gospels as an elucidation of that first teaching of Christ. For Paul, faith is our response to the original mandate to believe the good news of the kingdom of God, which, as we have seen, includes all three aspects which Paul explains in his epistles.
Grace comes first.
Faith necessarily accompanies it. Faith shows itself under the three aspects of theological faith, hope, and charity. This is the pure teaching of Jesus Christ, the good news of the kingdom of God. This is the teaching of St. Paul, that first and greatest commentator on the Gospels. This is the sublime teaching of the Catholic Church.