How do we know the Word of God is authoritative?

Psalm 19 addresses the authority of God's Word, stating that it is perfect and capable of converting the soul. The testimony of the Lord is sure, making wise the simple, and its statutes are right, bringing joy to the heart. This indicates that God's Word is not only authoritative but also transformative. Unlike any human works, it imparts divine knowledge and guidance, ensuring that we have a clear understanding of who God is and what He desires from us. Furthermore, the enduring nature of God's commands and their ability to enlighten the eyes highlight their import and necessity for a true understanding of God.