1 The LORD reigneth; let the people tremble: he sitteth between the cherubims; let the earth be moved.
2 The LORD is great in Zion; and he is high above all the people.
3 Let them praise thy great and terrible name; for it is holy.
4 The king's strength also loveth judgment; thou dost establish equity, thou executest judgment and righteousness in Jacob.
5 Exalt ye the LORD our God, and worship at his footstool; for he is holy.
6 Moses and Aaron among his priests, and Samuel among them that call upon his name; they called upon the LORD, and he answered them.
7 He spake unto them in the cloudy pillar: they kept his testimonies, and the ordinance that he gave them.
8 Thou answeredst them, O LORD our God: thou wast a God that forgavest them, though thou tookest vengeance of their inventions.
9 Exalt the LORD our God, and worship at his holy hill; for the LORD our God is holy.
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The Lord is called the One who reigns, and this means that however many kingdoms there may be on earth, and however highly their rulers may exalt themselves, He alone is the One who truly reigns over the world. But He is above earthly kings not only in power and majesty. The most important quality of His Kingdom, one that is difficult to achieve in human societies, is justice, and this alone places it above earthly kingdoms. Yet His justice surpasses our customary ideas about what justice should be: supreme justice is inseparable from mercy. The psalmist calls the Lord both forgiving and punishing, and we should note that forgiveness is mentioned first.
Although the Lord revealed Himself to prophets called from among one particular people, He is not only their God: through the Jewish people the Lord revealed Himself to all humanity. Moses and Aaron, prophet and priest, are not mentioned side by side here by chance. The ministry of each is important and necessary; each, in his own place, served the One who called them and guarded the truth entrusted to them. They did not guard it as esotericists guard "secret knowledge," fearing that someone might penetrate mysteries hidden from the uninitiated. No, Moses and Aaron, and their successors, kept the truth pure so that it might become the possession of the whole people and, in time, of other nations as well, so that they too might in due course acknowledge who their true King is.
Other notes
For Psa 99:1-5
1 The LORD reigneth; let the people tremble: he sitteth between the cherubims; let the earth be moved.
2 The LORD is great in Zion; and he is high above all the people.
3 Let them praise thy great and terrible name; for it is holy.
4 The king's strength also loveth judgment; thou dost establish equity, thou executest judgment and righteousness in Jacob.
5 Exalt ye the LORD our God, and worship at his footstool; for he is holy.
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Here it is, one of the most joyful psalms. Even if we had only the text before us and knew nothing...
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Here it is, one of the most joyful psalms. Even if we had only the text before us and knew neither which instruments sounded when it was created nor what its musical rhythms were like at the time, it would still not be difficult to hear them through the words and rhythms of the psalm itself. By its very sound, it proclaims that the news of the Lord is joy. After the Fall it became difficult for humans to stand before the Lord, and the desire to hide from Him arose and became habitual for many. But now the psalmist calls everyone to come before the Lord. He is good, and therefore every earthly fear crumbles before Him.
Here the faithful are called the sheep of His pasture, while in another, more dramatic psalm they are called the sheep of His hand. The same image speaks of His nearness to us both in joy and in difficult trials, and it is hardly by chance that the call to serve the Lord with gladness echoes Christ’s call not to look gloomy while fasting. The joy He gives is not an illusory emotion or a mad euphoria, but that deep joy which will not fade and which no one will take away from us.