The passion of David's heart was the presence of God. He longed to be with God, to know His presence, to serve The Lord and to worship Him in righteousness. It was the driving desire of his heart. David simply wanted to awaken to each new day satisfied in God alone.
The affections of the human heart are filled with competing desires. It is only when we really look at God and get a glimpse of His glory that perspective can come on these other desires. When our affections are centered upon God, all those other desires begin to wane in significance. The heart that is close to God will have no other loyalties than Him. Those other desires are ordered first around God and His kingdom. It is what Jesus meant when He advised His disciples to seek first God's kingdom and righteousness and everything else will be added to that.
This kind of driving passion is not easy to either obtain or maintain. It means fixing my eyes on Jesus. It means following the old sage advice: "anchor your heart on God and spend each day shortening the chain". At times my ship drifts further from that anchor. It requires conscious effort, holy fellowship with other believers, obedience to the holy scriptures, the convicting work of God's Holy Spirit and most of all the sanctifying work of God to achieve a heart that desires God above all else.