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
Men had become perplexed not merely as to the old faith, but as to their very selves; the fearful crises of a fifty years' revolution, the instinctive feeling that the civil war was still far from being at an end, increased the anxious suspense, the gloomy perplexity of the multitude.
Restlessly the wandering imagination climbed every height and fathomed every abyss, where it fancied that it might discover new prospects or new light amidst the fatalities impending, might gain fresh hopes in the desperate struggle against destiny, or perhaps might find merely fresh alarms.
A portentous mysticism found in the general distraction-- political, economic, moral, religious--the soil which was adapted for it, and grew with alarming rapidity; it was as if gigantic trees had grown by night out of the earth, none knew whence or whither, and this very marvellous rapidity of growth worked new wonders and seized like an epidemic on all minds not thoroughly fortified.
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Reference address : https://www.ellopos.net/elpenor/rome/4-12-nationality-religion-education.asp?pg=33