Error is always superficial and never penetrates deep into human nature. Persuasion about error, no matter how well entrenched, is often full of uncertainties and doubts which, although apparently solved, continue to re-appear. A mysterious unrest never really abandons those in the grip of error, although it has no strength in itself to turn them back to the peace of truth.
[Antonio Rosmini, Certainty, Clear and Watson, trs., Rosmini House (Durham: 1991) p. 209.]
