Psalm 99 moves us from the sheer awesome and terror of God’s holiness as God’s holiness comes to us. 

We are given certainty that holiness is nothing to mess with and that God’s making us holy is a gracious thing. 

A lot of thoughts in this psalm are described in the book of Hebrews. God reigns and we are priests in his kingdom. 

Ultimately, it is the blood of Jesus Christ that makes us holy and carries us into the presence of God and the holy of holies