Psalms 106:3

"Who can express the mighty acts of the Lord?" (ver. 2). Full of the consideration of the Divine works, while he entreateth His mercy, "Who," he saith, "can express the mighty acts of the Lord, or make all His praises heard?" We must supply what was said above, to make the sense complete here, thus, "Who shall make all His praises heard?" that is, who is sufficient to make all His praises heard? "Shall make" then "heard," he saith; that is, cause that they be heard; showing, that the mighty acts of the Lord and His praises are so to be spoken of, that they may be preached to those who hear them. But who can make "all," heard? Is it that as the next words are, "Blessed are they that alway keep judgment, and do righteousness in every time" (ver. 3); he perhaps meant those praises of His, which are understood as His works in His commandments? "For it is God," saith the Apostle, "who worketh in you," ...since He worketh in these things in a manner that cannot be spoken. "Who will do all His praises heard?" that is, who, when he hath heard them, doth all His praises? which are the works of His commandments. As far as they are done, although all which are heard are not performed, He is to be praised, who "worketh in us both to will and to do of His good pleasure." For this reason, while he might have said, all His commandments, or, all the works of His commandments; he preferred saying, "His praises." But unless there were some difference between judgment and righteousness, we should not read in another Psalm, "Until righteousness turn again unto judgment." The Scripture, indeed, loveth to place these two words together; as, "Righteousness and judgment are the habitation of His seat;" and this, "He shall make thy righteousness as clear as the light, and thy judgment as the noon-day;" where there is apparently a repetition of the same sentiment. […]

I implore, you, dearly beloved, always to call to mind and remember what we have mentioned for the salvation of your soul. Do not accept it only in passing; our sermon ought to fasten its roots in your heart, so that on judgment day it …

Blessed are they that keep judgment,.... Or "observe" (k) it; the righteous judgment of God on wicked men; by which he is known in his justice, holiness, truth, and faithfulness; and by which the inhabitants of the earth observing it, learn to do righteousness, as follows: or else it may intend the word of God, his laws, statutes, and ordinances, after called his judgments, Psa 19:9, which should be observed and kept, as the rule of our actions, walk, and conversation.

God's people are those whose principles are sound-- They keep judgment (they adhere to the rules of wisdom and religion, and their practices are agreeable); they do righteousness, are just to God and to all men, and herein they are steady and constant; they do it at all times, in all manner of conversation, at every turn, in every instance, and herein persevering to the end.

The blessing is limited to those whose principles and acts are right. How "blessed" Israel would be now, if he had "observed God's statutes" (Ps 105:45). In view of the desert of sins to be confessed, the writer invokes God's covenant mercy to himself and the Church, in whose welfare he rejoices.