See here, 1. That it has been the lot of the best saints to be afflicted. The proud and the wicked lived in pomp and pleasure, while David, though he kept close to God and his duty, was still in affliction. Waters of a full cup are wrung out to God's people, Psa 73:10. 2. That it has been the advantage of God's people to be afflicted. David could speak experimentally: It was good for me; many a good lesson he had learnt by his afflictions, and many a good duty he had been brought to which otherwise would have been unlearnt and undone. Therefore God visited him with affliction, that he might learn God's statutes; and the intention was answered: the afflictions had contributed to the improvement of his knowledge and grace. He that chastened him taught him. The rod and reproof give wisdom.

I know, O Lord, that thy judgments are right,.... His word, the doctrines and precepts of it, they are all consistent with the holiness and righteousness of God; and so are his judgments on wicked men, they are righteous, just, and true: God is righteous in all his ways, there is no unrighteousness in any dispensation of his; and such are his corrections of his own people, and which seem to be chiefly intended here and are so called, because they are done in judgment, with moderation and gentleness, in wisdom, and to answer the best purposes; and they are all right, for the good and profit of the people of God, that they may be partakers of his holiness, and not be condemned with the world: this the psalmist knew by experience and owned and acknowledged;

and that thou in faithfulness hast afflicted me; in faithfulness to himself, his covenant, and promise; that upon forsaking his law, and not walking in his statutes, he would visit sin with a rod, and transgressions with stripes, though he would not take away his lovingkindness; and in faithfulness to David, for his spiritual and eternal good, in great sincerity, heartily, cordially, with real affection and love: his rebukes were faithful; the chastisement was not above measure or desert, nor above strength to bear it; see Psa 89:30.