And I will bring the third part through the fire, and will refine them as silver is refined, and will try them as gold is tried: they shall call on my name, and I will hear them: I will say, It is my people: and they shall say, The LORD is my God.
This is part of an awesome prophecy of Christ. Here's the context:
Zech 13:1 In that day there shall be a fountain opened to the house of David and to the inhabitants of Jerusalem for sin and for uncleanness.
2 And it shall come to pass in that day, saith the LORD of hosts, that I will cut off the names of the idols out of the land, and they shall no more be remembered: and also I will cause the prophets and the unclean spirit to pass out of the land.
3 And it shall come to pass, that when any shall yet prophesy, then his father and his mother that begat him shall say unto him, Thou shalt not live; for thou speakest lies in the name of the LORD: and his father and his mother that begat him shall thrust him through when he prophesieth.
4 And it shall come to pass in that day, that the prophets shall be ashamed every one of his vision, when he hath prophesied; neither shall they wear a rough garment to deceive:
5 But he shall say, I am no prophet, I am an husbandman; for man taught me to keep cattle from my youth. And one shall say unto him, What are these wounds in thine hands?
6 Then he shall answer, Those with which I was wounded in the house of my friends.
7 Awake, O sword, against my shepherd, and against the man that is my fellow, saith the LORD of hosts: smite the shepherd, and the sheep shall be scattered: and I will turn mine hand upon the little ones.
8 And it shall come to pass, that in all the land, saith the LORD, two parts therein shall be cut off and die; but the third shall be left therein.
9 And I will bring the third part through the fire, and will refine them as silver is refined, and will try them as gold is tried: they shall call on my name, and I will hear them: I will say, It is my people: and they shall say, The LORD is my God.
Is this the one?
Anyway, I found it! There are two separate ones: Sirach 2:1-6 and Sirach 4:11-19.
Sirach 2:1-6 My son, when you come to serve the Lord, prepare yourself for trials. Be sincere of heart and steadfast, undisturbed in time of adversity. Cling to him, forsake him not; thus will your future be great. Accept whatever befalls you, in crushing misfortune be patient; For in fire gold is tested, and worthy men in the crucible of humiliation. Trust God and he will help you; make straight your ways and hope in him.
Sirach 4:11-19 Wisdom instructs her children and admonishes those who seek her. He who loves her loves life; those who seek her out win her favor. He who holds her fast inherits glory; wherever he dwells, the Lord bestows blessings. Those who serve her serve the Holy One; those who love her the Lord loves. He who obeys her judges nations; he who hearkens to her dwells in her inmost chambers. If one trusts her, he will possess her; his descendants too will inherit her. She walks with him as a stranger, and at first she puts him to the test; Fear and dread she brings upon him and tries him with her discipline; With her precepts she puts him to the proof, until his heart is fully with her. Then she comes back to bring him happiness and reveal her secrets to him. But if he fails her, she will abandon him and deliver him into the hands of despoilers.
This comes from the New American Bible (Catholic). I know this reads differently in various versions and in the Protestant Bible (King James I think) the first quote from Sirach uses silver instead of gold.
Now, this is just my opinion of course and we all have our understandings and verses that speak to us, but I see here that the Wisdom referred to is not a wisdom of the brain, but a wisdom of the heart. In some mystical traditions it is thought that this is where God resides and the experience of Divine Union occurs here. Anyway, I could go on and on completely off the subject and I can't remember if you are Catholic or not. At any rate, these two excerpts are two of my favorites and have helped me in the past. I just wanted to share them with you. On that note, I am going to mark these pages so I don't lose them again!