(…) Touch alone is sufficient for bodily defilement, for nothing is so dangerous as this sense. Remember him who wrapped his hand in his cassock when about to carry his sick mother, and deaden your hand to natural or unnatural things, whether your own or another’s body.
(…) Let no one get into the habit of thinking over during the day-time the phantasies that have occurred to him during sleep; for the aim of the demons in prompting this is to defile us while we are awake by making us think about our dreams.
Let us listen again to another wile of our foes. Just as food bad for the body produces sickness after a time or some days, so this often happens in the case of actions which defile the soul. I have seen some give way to luxury and not at once feel the attacks of the enemy. I have seen others eat with women and converse with them and at the time have no bad thoughts whatsoever in their mind. They were thus deceived and encouraged to grow careless and to think that they were in peace and safety, and they suddenly suffered destruction in their cells. But what bodily and spiritual destruction comes to us when we are alone? He who is tempted knows. And he who is not tempted does not need to know.
On these occasions the best aids for us are: sackcloth, ashes, all-night standing, hunger, moistening the tongue in moderation when parched with thirst, dwelling amongst the tombs, and above all humility of heart; and if possible a spiritual father or a careful brother, an elder in spirit to help us. But I shall be surprised if anyone will be able to save his ship from the sea by himself.
(…) Let us by every means in our power avoid either seeing or hearing of that fruit which we have vowed not to taste. For it is absurd to think ourselves stronger than the Prophet David—that is impossible.
Who has conquered his body? He who has crushed his heart. And who has crushed his heart? He who has denied himself. For how can he not be crushed who has died to his own will?
St. John Climacus, The Ladder of Divine Ascent