George Haydock's Catholic Commentary
Psalms 17:31
As for, might be omitted. (Haydock) --- The conduct of God towards men is irreproachable. He will treat all according to their deserts, and will fulfil his promises of protecting the just. (Eusebius) --- Hebrew, "He is the strong God....his words are pure as gold....He is the shield," &c. (Berthier)