Sirach 3:26
Ben Sira, Ecclesiasticus25 Without eyes there is no light; without knowledge there is no wisdom. 26 A stubborn mind will fare badly at the end, and whoever loves danger will perish in it. 27 A stubborn mind will be burdened by troubles, and the sinner adds sin to sins. 28 When calamity befalls the proud, there is no healing, for an evil plant has taken root in him. 29 The mind of the intelligent appreciates proverbs, and an attentive ear is the desire of the wise.
Augustine Confessions 6.12
For when he wondered that I, for whom he had no slight esteem, stuck so fast in the bird-lime of that pleasure as to affirm whenever we discussed the matter that it would be impossible for me to lead a single life, and urged in my defense when I saw him wonder that there was a vast difference between the life that he had tried by stealth and snatches (of which he had now but a faint recollection, and might therefore, without regret, easily despise), and my sustained acquaintance with it, whereto if but the honourable name of marriage were added, he would not then be astonished at my inability to contemn that course — then began he also to wish to be married, not as if overpowered by the lust of such pleasure, but from curiosity. For, as he said, he was anxious to know what that could be without which my life, which was so pleasing to him, seemed to me not life but a penalty. For his mind, free from that chain, was astounded at my slavery, and through that astonishment was going on to a desire of trying it, and from it to the trial itself, and thence, perchance, to fall into that bondage whereat he was so astonished, seeing he was ready to enter into a covenant with death; and he that loves danger shall fall into it.
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