Stand guard, then, over your heart and keep a watch on your senses; and if the remembrance of God dwells peaceably within you, you will catch the thieves when they try to deprive you of it. When a man has an exact knowledge about the nature of thoughts, he recognizes those which are about to enter and defile him, troubling the intellect with distractions and making it lazy. Those who recognize these evil thoughts for what they are remain undisturbed and continue in prayer to God.
