Ps 19 1 The heavens declare the glory of God;
the skies proclaim the work of his hands.
2 Day after day they pour forth speech;
night after night they display knowledge.
3 There is no speech or language
where their voice is not heard.
4 Their voice goes out into all the earth,
their words to the ends of the world."

The heavens display Gods law in action. They are a display of who God is. Everything that is created or works according to their purpose is order by the spoken word of God. 147 15 He sends his command to the earth;his word runs swiftly.147 16 He spreads the snow like wool and scatters the frost like ashes.17 He hurls down his hail like pebbles.Who can withstand his icy blast?18 He sends his word and melts them;he stirs up his breezes, and the waters flow."The Psalmist is teaching what is behind a snow storm as it moves and falls to earth as well as melting on the ground. In this sense the Psalmist is alluding to the King who pronounces the event.
So we see that activity of the law is both in the creation of the beauty which is the snow falling and also in the taking away of the beauty which is the snow melting.18 15 The valleys of the sea were exposed and the foundations of the earth laid bare at your rebuke, O LORD, at the blast of breath from your nostrils." Here is the same metaphor for Gods word that is compared to blasting of His breath, He is describing time in the battle when the enemy turns and runs away. He is saying that Gods curses have been successful so that His blessing will follow. The Psalmist is describing the different effects of Gods word according to the human characteristics. If you only pronouncing Gods law without it affecting the creation then it would be mysticism. But Gods law goes and does not return void.
This is why man has a natural lack of faith in Gods word. Its hard for us to believe that when God speaks it is miraculous. If we really believed that Gods word is the cause of the physical universe then we would use it for our benefit and the good of others.138 4,5 May all the kings of the earth praise you, O LORD, when they hear the words of your mouth. May they sing of the ways of the LORD, for the glory of the LORD is great." The pronouncement of Gods word that is on our lips is eternal . At some point in the history of man on the earth it can create the total unity of all kings and nations. We are given universal pronouncements. We can rule the earth without being the king by occupation. The Psalmist is uniting our future eternal experience with our ability in this corrupted earth by pronouncing Gods word to rise up to the mystery in experience of something that is too wonderful for us to understand. It will be experienced in reality in the eternal state.