God's Word is the source of all existence
When God speaks, He creates. He brings something into existence just as He created light by using words. We can find praise for His creating power in Psalm 148. The writer urges all creation (the angels, the sun and moon and stars) to glorify God. In verse 5 he explains the reason for this worship
Let them all praise the name of the Lord! He commanded, and they were created.
God created more than the heavens and the earth. He spoke laws, promises and truths into existence. These are written down in His Word for the reader to meditate on and live by!