"None of you have ever seen fully the plague of your own heart. There are chambers in your heart you have never yet seen into - there are caves in that ocean you have never fathomed - there are fountains of bitterness you have never tasted. When you have felt the wickedness of your heart to the uttermost, then lie down under this awful truth, that you have only seen a few yards into a pit that is bottomless - that you carry about with you a slumbering volcano - a heart whose wickedness you do not and cannot know."--Robert Murray M'Cheyne