David composed Psalm 68 to celebrate the arrival of the Ark of the Covenant in Zion. --Psalm 68-1 quotes Numbers 10-35, citing the very words proclaimed when the Ark set out. While God is omnipresent -Psalm 139-7-12-, there are places of his special presence -Psalm 16-11-. And the Ark not only symbolized God's special presence- it was where God communed with his people -Exodus 25-22-.--That is why carelessly handling the Ark was deadly -2 Samuel 6-6-9-. But when David followed the divine instructions -2 Samuel 6-13-15- 1 Chronicles 15-1-2, 25-28-, he had success and celebrated with great exuberance. This emotional display embarrassed and angered some people -2 Samuel 6-16, 20-23- 1 Chronicles 15-29-.--Thus this Psalm celebrates the coming of Israel's God to Jerusalem -- from Sinai to Zion -- accompanied by the armies of heaven -Psalm 68-7-17-. But Psalm 68-18 looks beyond David's bringing the Ark- it clearly points to the victory of David's greater Son, the Lord Jesus Christ, who descended into Sheol in order to defeat Satan and the hosts of hell -Hebrews 2-14-15- Ephesians 4-8-10-.--The Lord Jesus has plundered the forces of evil and has imparted gifts to his Church -Ephesians 4-11-13-, and at the moment of death we now experience what Old Testament believers did not- -Absent from the body, present with the Lord- -2 Corinthians 5-6-8-.