There are three vioices in Psalm 19:1-14. The first voice is the voice of creation. Like other parts of the Bible, Psalm 19 teaches that all that we see in the created order testifies to the truth that God exists and that by all that He has made, He has spoken to all mankind about His existence. This is true for people all over the world. No-one can say they did not know that God existed. The second voice in the Psalm is the voice of God’s Word. While God’s voice through creation can be ignored or misinterpreted, He has also spoken to us through His Word, which, for the writer of the Psalm, were the books of God’s law which he treasured above everything. The third voice in the Psalm is the voice of God’s servant, who asked God to cleanse his heart from hidden sins and faults. The one who loves God over all things will want to be pure in order to serve Him and be ready to obey Him from the heart.