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
"To me too," his mother wrote to him, "nothing seems finer and more glorious than to retaliate on an enemy, so far as it can be done without the country's ruin. But if this is not possible, then may our enemies continue and remain what they are, a thousand times rather than that our country should perish." Cornelia knew her son; his creed was just the reverse.
Vengeance he would wreak on the wretched government, vengeance at any price, though he himself and even the commonwealth were to be ruined by it--the presentiment, that fate would overtake him as certainly as his brother, drove him only to make haste like a man mortally wounded who throws himself on the foe.
The mother thought more nobly; but the son-- with his deeply provoked, passionately excited, thoroughly Italian nature--has been more lamented than blamed by posterity, and posterity has been right in its judgment.
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Reference address : https://www.ellopos.net/elpenor/rome/4-03-revolution-gaius-gracchus.asp?pg=16