The Twelve Books on the Institutes of the Cœnobia, and the Remedies for the Eight Principal Faults

For no one is ever driven to sin by being provoked through another’s fault, unless he has the fuel of evil stored up in his own heart. Nor should we imagine that a man has been deceived suddenly when he has looked on a woman and fallen into the abyss of shameful lust: but rather that, owing to the opportunity of looking on her, the symptoms of disease which were hidden and concealed in his inmost soul have been brought to the surface.