It has long been a critical obligation for commentators on the History of the Decline and Fall of the Roman Empire to remark on Edward Gibbon's failure to explain the reasons for that fall. Historians in particular have been bothered by this: both J. B. Black and D. M. Low have fretted over Gibbon's refusal — or inability — to deal with the ultimate meaning of the events he describes or, in the last three volumes, to “propound and answer questions explicitly.” Readers of the History, on the other hand, may feel that the historian belabors too often the “causes” of events, those “connections in a sequence.” Regularly, Gibbon reminds us that he is dealing with a process of degeneration involving successive stages of decay; and both within individual sections and at the close of units, he carefully recapitulates that the policies of Augustus or Septimius Severus, the strengthening of the Pretorian Guard, the spread of Christianity, the weakening of senatorial authority, monetary and land policies, the invasions of the Goths and Huns were all “causes” for the decline of the Roman Empire.
The contradiction between the reactions of critic and casual reader is merely apparent. His commentators grant that Gibbon assayed explanations for the events he recounted; but, they say, his purported “causes” are not primary or even secondary ones. They claim, in fact, that the explanations seldom account for the single chains of events he describes, much less for the long, intricate process that Gibbon sees as steady and unmitigated decline.