What does Psalm 12:6 mean?

A theme of David's writing is full confidence in God's goodness, His wisdom, and His Word (Psalm 18:30; 33:4; 40:8). Here, David uses the example of refining precious metals to explain the perfection and purity of God's Word.

Metals such as silver and gold are separated from impurities by melting; this burns away most of the worthless material. Repeating this process, using different techniques or by adding other chemicals, can further separate out undesirable substances. Here, David refers to the number of perfection, seven, applying it to the refinement of God's Word. The Lord's statements are perfect and complete. No one can improve on them; nor should anyone add to them. Unlike the lies and flattery used by the oppressors of the poor and needy to achieve their wicked goals (Psalm 12:2), the Lord's words are true and reliable.

In His prayer for His followers, Jesus asks the Father to sanctify them by His Word. He adds, "Your word is truth" (John 17:17). Psalm 119:72 puts a higher value on the Word of the Lord than on a great number of gold and silver pieces. God's Word brings the knowledge of salvation and the power to lead a righteous, effective life (2 Timothy 3:15–17).