THE HEART OF MAN - IT'S NATURE
Gen. 6:5. "Every imagination of the thoughts of his heart was only evil continually.''
Emmanuel refuses even to allow a letter from Diabolus to enter the town of Mansoul. (Holy War, Bunyon) A preacher has well said: "There must be no correspondence whatever. The devil's letters are evil hints and suggestions, and if you entertain them, then you are opening up a correspondence with him. Whenever you get a letter addressed in his hand-writing, with the post-mark of hell on it, destroy it at once."
Luther said, "I cannot help unclean birds flying over my head, but 1 can keep them from building and breeding in my hair." So we cannot help evil thoughts crossing our minds, but we can keep them from dwelling there.