One might think that the  phrase of Lord Acton (that ‘it cannot  really be held that     in Rome sixteen centuries after Christ men did  not know that murder  was wrong’) might     be held to apply [to the  Inquisition]; it cannot be that men did not  think such methods      doubtfully holy. It was not so. Deep, deeper than we believe, lie  the  roots of sin;     it is in the good that they exist; it is in the good  that they  thrive and send up     sap and produce the black fruits of  hell. The peacock fans of holy  and austere popes     drove the ashes of  burning men over Christendom.
(The Descent of the Dove)

 
