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
The education of youth remained entirely confined within the limits of the narrowest domesticity. The boy never left his father's side, and accompanied him not only to the field with the plough and the sickle, but also to the house of a friend or to the council-hall, when his father was invited as a guest or summoned to the senate. This domestic education was well adapted to preserve man wholly for the household and wholly for the state.
The permanent intercommunion of life between father and son, and the mutual reverence felt by adolescence for ripened manhood and by the mature man for the innocence of youth, lay at the root of the steadfastness of the domestic and political traditions, of the closeness of the family bond, and in general of the grave earnestness (-gravitas-) and character of moral worth in Roman life.
This mode of educating youth was in truth one of those institutions of homely and almost unconscious wisdom, which are as simple as they are profound. But amidst the admiration which it awakens we may not overlook the fact that it could only be carried out, and was only carried out, by the sacrifice of true individual culture and by a complete renunciation of the equally charming and perilous gifts of the Muses.
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Reference address : https://www.ellopos.net/elpenor/rome/1-15-art.asp?pg=27