When we look at the world, it is possible to think that God is not in control. The Jewish people likely felt that way when the Babylonians destroyed the Temple. As the Bible tells us, after 70 years of exile, thousands of Jews returned to Jerusalem and recommitted themselves to God. Many of these events are detailed in the books of Ezra and Nehemiah. This may have also been the time that Psalm 93 was written.
One of the most well known aspects of Jesus' ministry was His miraculous healing ability. The gospel accounts are filled with stories of Him healing lepers, the diseased, and more. These miracles are used for a variety of reasons. Interestingly enough, there is at least one instance where a healing is related to the topic of authority.
The Word of God begins with the One who creates. It doesn't start with mountains or trees or the stars. Instead of beginning with the world we see around us its initial focus is on God Himself. This is fitting, for without God there is nothing. Although it may not be immediately apparent, we see God's authority throughout the first chapter of Genesis.