Reputantibus §1

¹ As We reflect often on the condition of your churches, it seems to Us that at this moment nearly everywhere everything is full of fear, full of concern. However, this situation is more serious in your case because, while Catholicism is exposed to the hatred and cunning of external enemies, domestic issues also divide it. For while heretics both openly and covertly endeavor to spread error among the faithful, seeds of discord grow daily among Catholics themselves - the surest means to hinder strength and break down constancy.