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If Ward is right, Lewis has crafted each novel in the light of the atmosphere associated with one of the planets in the medieval tradition. This does not necessarily mean that this symbolism determines the plot of each novel, or the overall series; it does, however, help us understand something of the thematic identity and stylistic tone of each individual novel. Ward’s analysis is generally agreed to have opened up important new ways of thinking about the Narnia series, although further discussion and evaluation will probably lead to modification of some of its details. There is clearly more to Lewis’s imaginative genius than his earlier interpreters appreciated. If Ward is right, Lewis has used themes drawn from his own specialist field of medieval and Renaissance literature to ensure the coherency of the Chronicles of Narnia as a whole, while at the same time giving each book its own distinct identity.
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Alister E. McGrath (C. S. Lewis: A Life: Eccentric Genius, Reluctant Prophet)