Sirach 2:5
Ben Sira, Ecclesiasticus3 Cling to him and do not depart, so that your last days may be prosperous. 4 Accept whatever befalls you, and in times of humiliation be patient. 5 For gold is tested in the fire, and those found acceptable, in the furnace of humiliation. 6 Trust in him, and he will help you; make your ways straight, and hope in him. 7 You who fear the Lord, wait for his mercy; do not stray, or else you may fall.
Cyprian Treatises 7:9
9 Moreover, if the Christian know and keep fast under what condition and what law he has believed, he will be aware that he must suffer more than others in the world, since he must struggle more with the attacks of the devil. Holy Scripture teaches and forewarns, saying, My son, when you come to the service of God, stand in righteousness and fear, and prepare your soul for temptation. And again: In pain endure, and in your humility have patience; for gold and silver is tried in the fire, but acceptable men in the furnace of humiliation.
Notes and References
"... The eighty-fifth of the Apostolical Canons provides a list of the books in the Hebrew Canon and additionally includes the first three books of the Maccabees and the Wisdom of Sirach. However, these last four books are not included in the Canon, although the Wisdom of Sirach is specially recommended for the instruction of the young. In the Apostolical Constitutions, specifically in sections vi. 14 and 15 (also known as the Didascalia), quotations from Sirach are given with the same formula as those from the books of the Hebrew Canon. Yet, in section ii. 57 of the same work, there is no mention of any of the books of the Apocrypha. On the other hand, at the Council of Hippo in A.D. 393, Sirach was specially mentioned as one of the canonical books. This was further supported at the Council of Carthage in A.D. 397, where the "five books of Solomon," namely Proverbs, Ecclesiastes, Canticles, Wisdom, and Sirach, were reckoned among the canonical Scriptures. (Between the years A.D. 390 and 419 no less than six councils were held in Africa, and four of these at Carthage. For a time, under the inspiration of Aurelius and Augustine, the Church of Tertullian and Cyprian was filled with a new life before its fatal desolation ...) This decision was also confirmed by the Council of Carthage in A.D. 419. As we delve into what the Church Fathers have said regarding the canonicity of the book, our attention first turns to the Eastern Church ..."
Charles, R. H. The Apocrypha and Pseudepigrapha of the Old Testament (p. 299) Oxford University Press, 1913