Psalm 9:1,5 King (KJV)
I will praise thee, O Lord, with my whole heart; I will shew forth all thy marvellous works.
I will be glad and rejoice in thee: I will sing praise to thy name, O thou most High.
When mine enemies are turned back, they shall fall and perish at thy presence.
For thou hast maintained my right and my cause; thou satest in the throne judging right.
Thou hast rebuked the heathen, thou hast destroyed the wicked, thou hast put out their name for ever and ever.

I will praise the Lord. David begins the psalm in this way, to induce God to succor him in the calamities with which he was now afflicted. As God continues his favor towards his own people without intermission, all the good he has hitherto done to us should serve to inspire us with confidence and hope, that he will be gracious and merciful to us in the time to come.