Psalms 111:8

They stand fast forever and ever - Margin, “established.” The Hebrew word means “sustained, supported.” They will not fail or fall. Whatever else may be shaken, his law, his word, and the principles of his administration, will not fail. See the notes at Matthew 5:18. Compare Luke 16:17; Matthew 24:35. The great principles of truth and righteousness will stand, and whatever is founded on those principles will endure forever.

And are done in truth and uprightness - Are based on truth, or on a just view of things; they are done in such a way that truth will be maintained and promoted. The word “uprightness” here means that all this is done on the principles of equity - of what “ought” to be done, or what is “best” to be done. Compare Psalms 19:9.