Humanum Genus §4

⁴ The Roman Pontiffs Our predecessors, in their incessant watchfulness over the safety of the Christian people, were prompt in detecting the presence and the purpose of this capital enemy immediately it sprang into the light instead of hiding as a dark conspiracy; and , moreover, they took occasion with true foresight to give, as it were on their guard, and not allow themselves to be caught by the devices and snares laid out to deceive them.