Sirach 18:30
Ben Sira, Ecclesiasticus28 Every intelligent person knows wisdom, and praises the one who finds her. 29 Those who are skilled in words become wise themselves, and pour forth apt proverbs. 30 Do not follow your base desires, but restrain your appetites. 31 If you allow your soul to take pleasure in base desire, it will make you the laughingstock of your enemies. 32 Do not revel in great luxury, or you may become impoverished by its expense.
Augustine Confessions 10.31
You give us many things which we pray for; and whatever good we receive before we prayed for it, do we receive from You, and that we might afterwards know this did we receive it from You. Drunkard was I never, but I have known drunkards to be made sober men by You. Your doing, then, was it, that they who never were such might not be so, as from You it was that they who have been so heretofore might not remain so always; and from You, too was it, that both might know from whom it was. I heard another voice of Yours, Go not after your lusts, but refrain yourself from your appetites.
Notes and References
"... As to Augustine’s use of the Book of Ecclesiasticus, it is striking that more than once he quotes a text that is somewhat different from the Vetus Latina, which for the Book of Ben Sira, serves as the traditional Latin text. Since Augustine’s quotations from the Book of Ben Sira have more than once been brought in line with the Greek translation, a thorough investigation into this phenomenon is needed in order to find out whether he had (some) knowledge of the Greek text of the Book of Ecclesiasticus. Apart from Speculum in which Augustine for his quotations from the Book of Ben Sira usually follows the Latin, in his other works he rather frequently appears to correct the Latin Ben Sira quotations according to the Greek. An investigation into this intriguing question would be very useful. Such an in depth inquiry should also take into full consideration whether, and to what extent, St. Augustine has been influenced by a text type of Ecclesiasticus that was already used by St. Cyprian and has even been given its own siglum (K) by Thiele ..."
Beentjes, Pancratius C. "Saint Augustine's Sermons 38-41 on the Book of Ben Sira" in Menken, M.J.J. (ed.) The Scriptures of Israel in Jewish and Christian Tradition: Essays in Honour of Maarten J.J. Menken (pp. 81-94) Brill, 2013