David begins with a direct request: O God, save me by your name and vindicate me by your might. Hear my prayer; give ear to the words of my mouth. He explains his situation: strangers have risen against him and ruthless men seek his life; they do not set God before themselves.
Verse 4 brings the turn: behold, God is my helper; the Lord is the upholder of my life. He will return the evil to my enemies; in your faithfulness put an end to them. With his help David has a certainty: God will not stand idle.
The psalm ends with a promise and a testimony. With a freewill offering I will sacrifice to you; I will give thanks to your name, O Lord, for it is good. For he has delivered me from every trouble, and my eye has looked in triumph on my enemies. David speaks as if the deliverance had already happened, because his trust in God is complete.