"One of the outstanding examples of the unfree character of modern philosophical thought is perhaps the famous dispute between Hume and Kant. Kant often declared that Hume had awakened him out of “dogmatic slumber.” And in fact, when we read Hume and those passages of Kant in which he appeals to Hume, we might think that this could not be otherwise, and that what Hume saw and what was visible to Kant also, after Hume, must have awakened not only a sleeper, but even a dead man. Foreword p. xlv"