When we are still we can learn of His holiness. We can see His majesty. His good works in our lives and all He has done. We have to have time to reflect on these things or we lost sight of all God has done and all He is to us. All He has done for us in the past and all He has planned for the future.
"Marvelous are Your works, and that my soul knows very well." Psalm 139:14
Our soul will not know this well if we are never still in His presence.