“The noblest worship is to make yourself as good and as just as you can.”

Fragment xx.
Golden Sayings of Epictetus, Fragments

Source: Your Best Life Now: 7 Steps to Living at Your Full Potential

III, 3
Shobogenzo Zuimonki (1238)

Source: If You Could See Me Now

Source: A Woman's Thoughts About Women (1858), Ch. 10

Hays translation
V, 37
Meditations (c. AD 121–180), Book V

Richard Steele, in The Spectator. Compare Aeneid 6.823: Vincet amor patriae ("Love of country shall prevail").
"In The City of God Augustine quoted the line but changed the verb from the future to the present tense (vincet › vincit). That form became a traditional quotation, often reprinted and reproduced on medals, monuments, and family crests. [...] "Vincit amor patriae" appeared at the head of Spectator no. 200 (October 19, 1711) without translation. The essays from the Spectator were published and republished as books as early as 1713. To assist readers who lacked Latin or Greek, the editors of the 1744 edition provided English translations for its epigraphs; to "Vincit amor patriae" was added "The noblest Motive is the Publick Good." It stuck. The translation was modernized and made its way into innumerable texts and onto public buildings. It is inscribed on the ceiling of the south corridor of the Library of Congress and attributed to Virgil. A mistranslation became a quotation." —Willis Goth Regier, Quotology (2010), pp. 40–41.
Misattributed