" But when God speaks, it’s silver. Psalm 12:6 says, “The words of the LORD are flawless, like silver refined in a furnace…purified seven times.” Purity and silver go together best when it comes to describing God’s Word. Why does God choose this precious metal? Perhaps it’s because gold requires impurities so it can bond. But not silver. God is less interested in attractiveness and more interested in purity. "

― Joni Eareckson Tada , More Precious Than Silver: 366 Daily Devotional Readings