A little weed, says St. Cyril of Jerusalem, can eventually break a rock apart with its roots. If you let in thoughts of sin, the sins themselves will follow. Now, someone might say, “What can sin be? Is it a living thing? An angel? A demon? What is this thing working inside us?” It is not an enemy that attacks you from outside, but an evil shoot growing up from inside yourself. “Let your eyes look directly forward” (Proverbs 4:25), and there is no lust. Do
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