What does the Bible say about God's authority?

In the New Testament, two Greek words describe power: 'exousia' and 'dunamis.' 'Exousia' refers to authority, indicating His judicial power and jurisdiction, while 'dunamis' relates to His ability to perform mighty works. For instance, in Matthew 7:29, people recognized Jesus spoke with authority, not merely as a miracle worker. This authority underscores God's sovereignty over His creation, demonstrating that He commands both the natural and spiritual realms. The essence of His authority is further illustrated when Jesus declares that none can pluck His sheep out of His hand, revealing the security and permanence of salvation for those chosen by grace.