"And it shall come to pass in that day, that the great trumpet shall be blown, and they shall come who were ready to perish in the land of Assyria, and the outcasts in the land of Egypt, and shall worship the Lord in the holy mount at Jerusalem." Isaiah 27:13
Called by the sounding of the great trumpet, the perishing and outcasts "come." And what do they do when they come? Do they trifle with sin, mock God, and abuse his grace? We read not so. They "worship the Lord in the holy mount at Jerusalem." They worship him in spirit and in truth; they worship him in the beauty of holiness. With purified hearts, purged consciences, and spiritual affections, they fall down before him, and their souls are impressed with a sense of the greatness of his love. They had no such heavenly feelings before; they could not therefore worship the Three-One God in the holy mount nor at Jerusalem. The great trumpet had not been blown, the jubilee had not come, the chains had not been knocked off, the shackles not loosed, and the prison-gates not thrown open; they could not therefore worship God freely, fully and calmly, with liberty of access and freedom of spirit.
But where do they worship him? "In the holy mount." The holy mount we may understand to signify spiritually Mount Zion, the place where Jesus sits in glory. This is the ancient declaration of the Father, "Yet have I set my king upon my holy hill of Zion." Here Jesus ever sits with love in his heart, grace in his lips, and the gospel in his hands. He sits on a holy hill, sways a holy scepter, and rules in the hearts of a holy people. Men talk much of holiness; and indeed they may well talk of it, for it is a most solemn declaration, that "without holiness no man shall see the Lord." But what sort of holiness are most men seeking after? A holiness of the flesh, a sanctity of the creature. They must do this and abstain from that; and if they do this and abstain from that, then they are holy. So many prayers must be said, so many chapters read, so many duties done. This is a Popish holiness, the sanctified austerity of a St. Dominic, not that holiness without which no man shall see the Lord.
That is of a very different nature--different every way, in source, way, means, and end. The only true holiness is that which is produced by the Spirit of God in the soul. Other source or fountain there is none. And how does he produce it? By the law or the gospel? By the gospel, certainly. When the great trumpet of jubilee sounds in the soul, when it listens to the notes, and comes obedient to its call, it is to worship the Lord in his holy mount at Jerusalem. True holiness is then produced in the soul, for then there are given spiritual desires, spiritual affections, spiritual views, spiritual feelings, and spiritual hearts. This is the holiness which is wrought in the soul by the Spirit of God, and without which no man shall see the Lord.