Sirach 2:5

Ben Sira, Ecclesiasticus

3 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.

Date: 195-175 B.C.E.
* Dates are based on scholarly estimates

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.

Date: 245-260 C.E.
* Dates are based on scholarly estimates