Charles H. Spurgeon on Psalms 99:3

Let them praise thy terrible name. What force the experience of a burdened conscience attaches to the expression, "Thy great and terrible name; for it is holy!" The misery of sin consists not merely in its consequences, but in its very nature, which is to separate between God and our souls, and to shut us out from God, and God from us. Yet the Spirit of God indicates, in the covenant of grace, a threefold practical influence of his holiness upon us, of which the issue is the opposite of despair. The various steps are marked as praise, exaltation, and worship (Ps 99:3, 5, 9). Of these the last seems by far the most difficult to realise. For it is in the nature of conscious sin to prevent even our approaches to God, to keep us from all comfortable fellowship with God, and to fill us with a heavy sense of our infinite and almost hopeless distance from him. Yet we will "praise thy great and terrible name; for it is holy." Great it is; most glorious and high; far above all human conceptions. Viewed in this light, even the fact otherwise so consoling, "The Lord reigneth, "leads only to the inference, "Let the people tremble; "and "He sitteth between the cherubim" (or manifesteth himself as the covenant God) to the conclusion, "Let the earth be moved, "or stagger. But his name is not only great and terrible in its manifestations, "it is holy, "and therefore we "praise" it. His greatness is all arrayed on the side of goodness, his power on that of righteousness and truth. Alfred Edersheim, in "The Golden Diary of Heart Converse with Jesus in the Book of Psalms, "1873.