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 Bennett, Arnold, 1867-1931
 Chesterfield, Philip Dormer Stanhope, Earl of, 1694-1773
 Hegel, Georg W. F
 Huxley, Thomas Henry, 1825-1895
 Nietzsche, Friedrich
 Proudhon, P.-J. (Pierre-Joseph), 1809-1865
 Smiles, Samuel, 1812-1904
 Spinoza, Benedictus de, 1632-1677