[The Fellowship of the Ring] is like lightning from a clear sky; as sharply different, as unpredictable in our age as [William Blake's] Songs of Innocence were in theirs. To say that in it heroic romance, gorgeous, eloquent, and unashamed, has suddenly returned at a period almost pathological in its anti-romanticism, is inadequate. To us, who live in that odd period, the return—and the sheer relief of it—is doubtless the important thing. But in the history of Romance itself—a history which stretches back to the Odyssey and beyond—it makes not a return but an advance or revolution: the conquest of new territory.
Nothing quite like it was ever done before…. The utterly new achievement of Professor Tolkien is that he carries a comparable sense of reality unaided. Probably no book yet written in the world is quite such a radical instance of what its author has elsewhere called 'sub-creation'. The direct debt (there are of course subtler kinds of debt) which every author must owe to the actual universe, is here deliberately reduced to the minimum. Not content to create his own story, he creates, with an almost insolent prodigality, the whole world in which it is to move, with its own theology, myths, geography, history, palaeography, languages, and orders of beings—a world 'full of strange creatures beyond count'. The names alone are a feast … [and are] best of all … when they embody that piercing, high, elvish beauty of which no other prose writer has captured so much.