Psalm 12:6: “The words of the Lord are pure words, like silver tried in a furnace of earth, purified seven times.”
The verse tells us about the quality of the word of God. It is compared to the purified silver. It is just comparison that has to show how valuable and pure the words of God are. Could we say the same thing about our words? You know what? We can change that by daily reading the Bible, which is his word. That will eventually influence the way we think and also the way we speak. Start with one chapter per day. Then increase the quantity bit by bit.