The Lord reigns

Psalm 96:1-13
Sing to the Lord a new song, sing for joy.
Praise his name; proclaim his salvation day after day. Declare his glory among the nations, his marvelous deeds among all peoples.
For great is the Lord and most worthy of praise; he is to be feared above all gods.
Ascribe to the Lord, ascribe to the Lord glory and strengths. Splendor and majesty are before him; strength and glory are in his sanctuary.
The Lord reigns. The world is firmly established, it cannot be moved.
He comes to judge the earth. He will judge the world in righteousness and the peoples in his truth.
Why?
The song his people sing is a song of God's salvation, of his greatness and his glory - a song of universal joy when he comes to rule with justice.
When we sing worship song should be sing for joy, why some times we still not so joy, where is our faith?
When the Lord reigns in a nation, where the nation is firmly established, it cannot be moved. When a men is reigned by the Lord, his all are firmly established, it cannot be moved.
How?
Is the Lord my king? Yes, The Lord is my God, my king, my rock of salvation. I am his servant. I am a people in his pasture.