David's Final Hymn of Praise.
I will give thanks to YHWH according to his righteousness,
And will sing praise to the name of YHWH Most High.'
His final gratitude is expressed concerning the fact that God is righteous and behaves righteously, thus establishing the righteous and destroying the wicked, and this results in his singing praise to YHWH Most High and all that He is (His name). It is only the righteous who recognise the importance of righteousness, who can rejoice that God is truly righteous. Others wish that He was not so particular.