93 And yet, as long as we are journeying in exile over this earth, our peace and happiness will be imperfect. For such peace is not completely untroubled and serene; it is active, not calm and motionless. In short, this is a peace that is ever at war. It wars with every sort of error, including that which falsely wears the face of truth; it struggles against the enticements of vice, against those enemies of the soul, of whatever description, who can weaken, blemish, or destroy our innocence or Catholic faith. This peace combats hatred, fraud, and discord, which can impair and cripple our faith.
Source: Ad Petri Cathedram (Vatican.va)