Robert Frost is by far the most celebrated major American poet of the twentieth century. But Frost was not just a powerful writer of popular lyric and narrative verse, argues Peter J. Stanlis. Rather, his work is deeply rooted in a complex philosophical dualism that opposes both idealistic monism and scientific positivism. Thoroughly informed by Stanlis’ twenty-three-year friendship and correspondence with Frost, this volume is the first to deal with the poet’s philosophy in a systematic manner.