The Illustrious French Bishop and Theologian, Jacques-Benigne Bossuet (d. 1704)
St. Cyprian, writing in the third century, warned that "there is an evil even worse and more deadly than persecution: the insidious poisoning of men's minds." In
the seventeenth century, the French bishop and theologian, Bossuet, wrote: "There are two sorts of persecution of the Church: the first kind is the violence used against it during its earliest beginnings under the Roman Empire;
the second is a subtle corruption which will occur during the last days."
Read more at: St. Cyprian Warns: Beware of Being Misled by Schismatics
"It is granted to few to recognize the true Church amid the darkness of so many schisms and
heresies, and to fewer still so to love the truth which they have seen as to fly to its embrace."
(St. Robert Bellarmine, Doctor
of the Church)