Psalm 119:142 ... Thy righteousness is an everlasting righteousness, and thy law is the truth.
Exhortation: Joan Boney ... apostle/prophet
Humans often think they are doing a "righteousness" in some good work. It may be something learned in childhood as "righteous". It may even be a type of self-righteousness. I know a woman who is always doing some work that she considers good. But when others fail to do the same work she becomes puffed up and angry with them. God said to me this woman is "self" righteous. She thinks herself to be doing righteous works and scorns others. But her works are not of God but of her own learned traits.
But the righteousness of God is not like this. It is a righteousness not just for this lifetime. It is a righteousness for ever.
And the law of God is truth no matter how humans explain it away with reasonings.
For example: Jesus said in Mt. 5:32 that the man who marries a divorced woman commits adultery. This does not seem reasonable to humans so they explain away this word. They use fleshly explanations to permit the divorced woman to remarry. In the day of judgment, this will become real for all eternity.