Albert Barnes Commentary Psalms 18:21

"For I have kept the ways of Jehovah, And have not wickedly departed from my God." — Psalms 18:21 (ASV)

For I have kept the ways of the Lord - I have obeyed his laws. I have not so violated the laws which God has given to regulate my conduct with my fellow men as to deserve to be treated by them as a guilty man.

And have not wickedly departed from my God - “ I have not been a sinner from my God;” an apostate; an open violator of his law. The treatment which I have received, though it would be justly rendered to an open violator of law, is not that which I have merited from the hand of man.