Please note that Mommsen uses the AUC chronology (Ab Urbe Condita), i.e. from the founding of the City of Rome. You can use this reference table to have the B.C. dates
From: The History of Rome, by Theodor Mommsen
Translated with the sanction of the author by William Purdie Dickson
As colours are effects of light and at the same time dim it, so art and science are not merely the creations but also the destroyers of faith; and, much as this process at once of development and of destruction is swayed by necessity, by the same law of nature certain results have been reserved to the epoch of early simplicity--results which subsequent epochs make vain endeavours to attain.
The mighty intellectual development of the Greeks, which created their religious and literary unity (ever imperfect as that unity was), was the very thing that made it impossible for them to attain to a genuine political union; they sacrificed thereby the simplicity, the flexibility, the self-devotion, the power of amalgamation, which constitute the conditions of any such union. It is time therefore to desist from that childish view of history which believes that it can commend the Greeks only at the expense of the Romans, or the Romans only at the expense of the Greeks; and, as we allow the oak to hold its own beside the rose, so should we abstain from praising or censuring the two noblest organizations which antiquity has produced, and comprehend the truth that their distinctive excellences have a necessary connection with their respective defects.
The deepest and ultimate reason of the diversity between the two nations lay beyond doubt in the fact that Latium did not, and that Greece did, during the season of growth come into contact with the East. No people on earth was great enough by its own efforts to create either the marvel of Greek or at a later period the marvel of Christian culture; history has produced these most brilliant results only where the ideas of Aramaic religion have sunk into an Indo-Germanic soil. But if for this reason Greece is the prototype of purely human, Latium is not less for all time the prototype of national, development; and it is the duty of us their successors to honour both and to learn from both.
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Reference address : https://www.ellopos.net/elpenor/rome/1-12-religion.asp?pg=28