On the Duties of the Clergy

St Ambrose of Milan (AD 339–397) · De officiis ministrorum · PL 16, 23–184

1. Chapter I. A Bishop's special office is to teach; St. Ambrose himself, however, has to learn in order that he may teach; or rather has to teach what he has not learnt; at any rate learning and teaching with himself must go on together
2. Chapter I. Happiness in life is to be gained by living virtuously, inasmuch as thus a Christian, whilst despising glory and the favour of men, desires to please God alone in what he does
3. Chapter I. We are taught by David and Solomon how to take counsel with our own heart. Scipio is not to be accounted prime author of the saying which is ascribed to him. The writer proves what glorious things the holy prophets accomplished in their time of quiet, and shows, by examples of their and others' leisure moments, that a just man is never alone in trouble

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St Thomas Aquinas, Summa theologiae 1265–1273 cites it 54 times

I, q. 5, a. 6 · II-II, q. 26, a. 8 · II-II, q. 32, a. 9 · II-II, q. 32, a. 10 · II-II, q. 40, a. 3 · II-II, q. 47, a. 2 · II-II, q. 57, a. 4 · II-II, q. 58, a. 3 · II-II, q. 58, a. 11 · II-II, q. 60, a. 6 · II-II, q. 77, a. 2 · II-II, q. 77, a. 3 · II-II, q. 89, a. 7 · II-II, q. 100, a. 4 · II-II, q. 117, a. 1 · II-II, q. 117, a. 5 · II-II, q. 117, a. 6 · II-II, q. 123, a. 2 · II-II, q. 123, a. 5 · II-II, q. 123, a. 9 · II-II, q. 123, a. 12 · II-II, q. 141, a. 2 · II-II, q. 141, a. 3 · II-II, q. 141, a. 8 · II-II, q. 144, a. 1 · II-II, q. 144, a. 4 · II-II, q. 145, a. 3 · II-II, q. 145, a. 4 · II-II, q. 155, a. 2 · II-II, q. 168, a. 1 · II-II, q. 168, a. 2 · II-II, q. 169, a. 1 · II-II, q. 180, a. 2 · II-II, q. 185, a. 7 · II-II, q. 186, a. 3 · II-II, q. 187, a. 5 · II-II, q. 188, a. 3

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Philip Schaff and Henry Wace (eds.), New York: Christian Literature Publishing Co., 1890-1900. Public domain: English translation first published 1885-1900 (Nicene and Post-Nicene Fathers, Second Series). Latin: Migne, Patrologia Latina (1844-1855), public domain; transcription from Corpus Corporum (University of Zurich).