28 Now in this also we see the immense difference between true and false reform. The advocates of false reform, imitating the fickleness of the foolish, generally rush into extremes. They either emphasize faith to such an extent that they neglect good works or they canonize nature with the excellence of virtue while overlooking the assistance of faith and divine grace. As a matter of fact, however, merely naturally good acts are only a counterfeit of virtue since they are neither permanent nor sufficient for salvation. The work of this kind of a reformer cannot restore discipline. On the contrary, it ruins faith and morals.
Source: Editae Saepe (Vatican.va)