The real remedy, as we have said, is to run away from all such occasions of sin. . . . In your meditations I am not of the opinion that, when the temptation is most violent, you should consider the degrading and insatiable nature of these sins in order to establish a hatred for impurity, that you should consider how they are followed by disgust, remorse and anxiety, even by the loss of one's fortune, health, life, honor, etc. These considerations are not appropriate to the situation and, instead freeing us from danger, they frequently only increase it. If the understanding drives away evil thoughts, these reflections naturally call them back.
The best way to become free of these is to remove not only the thoughts themselves, but also the reflections directly contrary to them. In attempting to dissipate them by their contraries, we merely renew the impure ideas and unconsciously imprint them still deeper. Be satisfied with meditation on the life and death of our Savior. If, while you are doing this, the same thoughts should return, even more disturbing than before, as may possibly happen, do not be discouraged or abandon your meditation, do not exert yourself in driving them away. Ignore and despise these miserable deceits of the devil and persist, with all possible attention, in your meditation on the death of our Savior. Nothing can be more effective in putting your enemy to flight, despite his determination to resist.
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The Spiritual Combat, chapter 19.