The sense of grief that pervades Tolkien’s writing is probably its greatest quality. There are a couple different facets to this, though. One is a genuine sense of sorrow. Much of Tolkien’s writing deals with themes of exile, loss and death, and these situations evoke genuine grief. Love is lost, life is lost, and home is lost. These things stain the land – the land itself is, in a sense, grieved.
Another facet, one that Lewis wrote on frequently, is longing – for Tolkien, the longing for Eden. Even though the world is a place of sorrow and grief, love and beauty still lurk. Then land which aches with the grief of war, exile and death also longs for the restoration of Eden and even the surpassing of Eden, when, to paraphrase the prophecy of Turin, all the wrongs, all the griefs, all the hurts of mankind are redressed and avenged and set right in one great victory.