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