Albert Barnes Commentary Psalms 145:17

"Jehovah is righteous in all his ways, And gracious in all his works." — Psalms 145:17 (ASV)

The Lord is righteous in all his ways – In his own character; in his laws; in his providential dealings; in his arrangements for the redemption and salvation of man. In his own character he is what it is desirable that a God should be; in all his laws he ordains only that which it is desirable should be enacted; in all his dealings with people he does that which it is desirable should be done. He violates no right; he wrongs no one; he demands of no one a service which would be unjust; he makes no arrangements for pardon and salvation that it is not best to make.

It is a great thing for a person to be able to say, in all that occurs to him under the divine administration, “It is right”; it is also a great thing for a person to have such confidence in God as to be able to feel that all he does regarding nations is the best thing that could be done. Compare the notes at Psalm 89:14 and Psalm 97:2.

And holy in all his works – Margin: merciful, or bountiful. The Hebrew word is merciful. The idea seems to be that righteousness and mercy are equally consulted in his arrangements, that they meet together and act harmoniously in the divine plans. Compare the notes at Psalm 85:10.