It is idle, it is disingenuous, to deny or to dissemble the early depravations of Christianity, its gradual but rapid departure from its primitive simplicity and purity, still more, from its spirit of universal love.
It may be no unsalutary lesson to the Christian world, that this silent, this unavoidable, perhaps, yet fatal change shall have been drawn by an impartial, or even an hostile hand.

The Christianity of every age may take warning, lest by its own narrow views, its want of wisdom, and its want of charity, it give the same advantage to the future unfriendly historian, and disparage the cause of true religion.
The design of the present edition is partly corrective, partly supplementary: corrective, by notes, which point out (it is hoped, in a perfectly candid and dispassionate spirit with no desire but to establish the truth) such inaccuracies or misstatements as may have been detected, particularly with regard to Christianity; and which thus, with the previous caution, may counteract to a considerable extent the unfair and unfavorable impression created against rational religion: supplementary, by adding such additional information as the editor's reading may have been able to furnish, from original documents or books, not accessible at the time when Gibbon wrote.
The work originated in the editor's habit of noting on the margin of his copy of Gibbon references to such authors as had discovered errors, or thrown new light on the subjects treated by Gibbon.

These had grown to some extent, and seemed to him likely to be of use to others.

The annotations of M.Guizot also appeared to him worthy of being better known to the English public than they were likely to be, as appended to the French translation.
The chief works from which the editor has derived his materials are, I.The French translation, with notes by M.Guizot; 2d edition, Paris, 1828.

The editor has translated almost all the notes of M.Guizot.