Most people have made this mistake of thinking Middle-earth is a particular kind of earth or is another planet of the science fiction sort but it's just an old fashioned word for this world we live in, as imagined surrounded by the Ocean.
J. R. R. TolkienWe meet again, at the turn of the tide. A great storm is coming, but the tide has turned.
J. R. R. TolkienIt does not do to leave a live dragon out of your calculations, if you live near him.
J. R. R. TolkienThe rule of no realm is mine. But all worthy things that are in peril as the world now stands, those are my care. And for my part, I shall not wholly fail in my task if anything that passes through this night can still grow fairer or bear fruit and flower again in days to come. For I too am a steward. Did you not know?
J. R. R. Tolkien