St. Maximus the Confessor: It is already much not to be roused to any passion by material things...

It is already much not to be roused to any passion by material things. 

It is even more to remain dispassionate when presented with mental images of such things. For the war which the demons wage against us by means of thoughts is more severe than the war they wage by means of material things.

St. Maximus the Confessor