You make your saving help my shield; your help has made me great

2 Samuel 22:36-51 

You make your saving help my shield;  your help has made me great. You provide a broad path for my feet, so that my ankles do not give way.

You armed me with strength for battle; you humbled my adversaries before me. You made my enemies turn their backs in flight, and I destroyed my foes.

The Lord lives! Praise be to my Rock! Exalted be my God, the Rock, my Savior! He is the God who avenges me, who puts the nations under me, who sets me free from my enemies. You exalted me above my foes; from a violent man you rescued me. Therefore I will praise you, Lord, among the nations; I will sing the praises of your name.

He gives his king great victories; he shows unfailing kindness to his anointed, to David and his descendants forever.

Why?

David remembered that the Lord had done great things for him.

It is the Lord chose David to be his servant and David did his best to follow the Lord.

How?

Remember God's love and mercy on me, and honor the Holy name of the Lord.