Saeculo Exeunte Octavo §36

³⁶ What is required here, is that sanctity of life which has cast deep roots into the soul, not that defective and empty probity which is easily infected by the corrupt habits of the infidels. Those who are described by Paul as "having a semblance indeed of piety, but disowning its power are not the salt of the earth which cures completely the wounds of corruption, nor the light of the world which teaches the way of salvation to those sitting in the shadow of death. And would that they themselves may not become liable to these corruptions, or, what is worse, unhappy teachers of them.