The masterpiece of DM, haunting, mystical, amazing in its depth and speaking for itself. As always it has many layers, depending on your interests - one meaning is about earthy love, and another - about heavenly one. In the second case "I give in", "preach", "sin", etc., should be taken rather literally, because it is not a dialog with a girlfriend anymore, or human at all, but with a night sky and God. About higher love, which is eternal, strange, wide like Milky Way river and painful (when you stray, completely give in to sin and temporary out of reach for your best friend).
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