"Section 12—The Bible in Education “The words of Jehovah are pure words; as silver tried in a furnace on the earth, purified seven times.” God's Word a Treasure House CT 421 The Bible is of the highest value because it is the word of the living God. Of all the books in the world it is the most deserving of study and attention, for it is eternal wisdom. The Bible is a history that tells us of the creation of the world and opens to us past centuries. Without it we should have been left to conjecture and fable in regard to the occurrences of the remote past. It reveals to us the Creator of the heavens and the earth, with the universe that He has brought into being, and it sheds a glorious light over the world to come. CT 421"
"The words of the Lord are pure words: as silver tried in a furnace of earth, purified seven times."
The EGW passage directly quotes Psalms 12:6, making it a clear and explicit allusion.