How do I interpret a letter I received?

I have found a letter in my mail. I noticed that it lacked a return address, but was sent through a post office in Denver. I opened it, to find a very odd letter. It was text from Chapter 53 of The Book of Isaiah (English translation, duh). Does anyone know how this could be interpreted in any sense? I do apologize if this may seem silly, but unfortunately, my paranoia is being very suspicious as of late.