Psalm 93
God rules. All of life is either submission to His rule or rejection of it. Regardless of which occurs, He is still the ruler of the whole universe. The rejection of God's rule can occur in two ways. direct open defiance or attempting to ignore his authority. Often there is a combination of both. Notwithstanding, God does in fact rule. There has never been or ever will be a time when God isn't sovereign over the universe. It may not seem that way at times.
In scripture floods are often a depiction of people, especially people who reject God. In verses 2-3, we see the mass of humanity in unison raising their voice to shout down God. Think of the cacophony in our world today of all the voices that reject God. The Arts, Sports, Entertainment, Academia, media, and forces of government are singing together to reject God and His authority. But all to no avail, God remains on his throne.
Beyond that, holiness extends to His house (verse 5); the rule of God and the lives of His people are expressed in holiness. Most personally God reigns in us through holy living.
“Help me, Lord, to express your authority by living a holy life. AMEN.”