Every Orthodox Christian in the sacrament of holy Baptism renounces the devil and all his works. But then, due to his own weakness and because of the constant attack on us by the enemies of our salvation, he sins. The book “Invisible Warfare,” created by the Athonite ascetic St. Nicodemus the Holy Mountain and translated from Greek by St. Theophan the Recluse, teaches “how to defeat one’s invisible enemies in order to acquire the treasures of true and divine virtues, and for this receive an incorruptible crown and an eternal pledge, which is unity with God both in this age and in the age to come.”
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