The demons of pride, self-esteem, desire for popularity, and hypocrisy, never act by trying to dampen the ardor of the virtuous man. Instead, they cunningly reproach him for his shortcomings where the virtues are concerned, and suggest that he intensifies his efforts, encouraging him to give his full attention to them. They do this in order to entice him to give his full attention to them; in this way they make him lose a proper balance and moderation, and lead him imperceptibly to a destination other than the one to which he thought he was going.
Neither do these demons hate self-restraint, fasting, almsgiving, hospitality, the singing of psalms, spiritual reading, stillness, the most sublime doctrines, sleeping on the ground, vigils, or any of the other things which characterize a life lived according to God, so long as the aim and purpose of a person trying to live such a life are tilted in their direction.
~St Maximos the Confessor