This psalm contains a three-fold theme. Creation, the law, and forgiveness serve as testimonies to the glory of God. Creation does not serve as an equal manifestation to the Law-Word, but rather in submission to the Word of the Lord, which is perfect and all together righteous. Creation is personified in the passage. This is a poetic way of explaining the world as a harmonious choir praising the excellence of God.
One way to begin to consider this passage is by acknowledging the Creator/creature distinction. Creation is not God. Creation speaks of God. Insofar as creation speaks of God, man is called to respond to that message. However, creation is not the end of that message. Creation points us to the words of God, which are sweeter than honey.