Psalms 147:20

And as for his judgments - The wondrous ordinances of his law, no nation had known them; and consequently, did not know the glorious things in futurity to which they referred.

He hath not dealt so with any nation - He has favored Israel more than any other people by giving them his revealed truth. This was so. There was no nation in the ancient world so favored as the Hebrew people in this respect. There is no nation now so favored as the nation that has the revealed will of God - the Bible. The possession of that book gives a nation a vast superiority in all respects over all others. In laws, customs, morals, intelligence, social life, purity, charity, prosperity, that book elevates a nation at once, and scatters blessings which can be derived from nothing else. The highest benevolence that could be shown to any nation would be to put it in possession of the word of God in the language of the people.

And as for his judgments, they have not known them - Other nations are ignorant of his laws, his statutes, his revealed will. They are consequently subjected to all the evils which arise from ignorance of those laws. The fact that the ancient people of God possessed them was a sufficient reason for the Hallelujah with which the psalm closes. The fact that we possess them is a sufficient reason why we should re-echo the shout of praise, and cry Hallelujah.