Charles H. Spurgeon on Psalms 12:6

"The words of the Lord are pure words: as silver tried in a furnace of earth, purified seven times." The expression may import two things: first, the infallible certainty of the word; and, secondly, the exact purity. First, the infallible certainty of the word, as gold endureth in the fire when the dross is consumed. Vain conceits comfort us not in a time of trouble: but the word of God, the more it is tried, the more you will find the excellency of it —the promise is tried, as well as we are tried, in deep afflictions; but when it is so, it will be found to be most pure. "The word of the Lord is tried; he is a buckler to all those who trust in him" (Proverbs 30:5); as pure gold suffers no loss by the fire, so the promises suffer no loss when they are tried, but stand to us in our greatest troubles. Secondly, it notes the exact perfection of the word: there is no dross in silver and gold that hath been often refined; so there is no defect in the word of God. Thomas Manton.