Nahum 1:5

Nahum continues still on the same subject, — that when God ascended his tribunal and appeared as the Judge of the world, he would not only shake all the elements, but would also constrain them to change their nature. For what can be less consonant to nature than for mountains to tremble, and for hills to be dissolved or to melt? This is more strange than what we can comprehend. But the Prophet intimates that the mountains cannot continue in their own strength, but as far as they are sustained by the favor of God. As soon, then, as God is angry, the mountains melt like snow, and flow away like water. And all these things are to be applied to this purpose, and are designed for this end, — that the wicked might not daringly despise the threatening of God, nor think that they could, through his forbearance, escape the punishment which they deserved: for he will be their Judge, however he may spare them; and though God is ready to pardon, whenever men hate themselves on account of their sins, and seriously repent; he will be yet irreconcilable to all the reprobate and the perverse. The mountains, then, before him tremble, and the hills dissolve or melt.

This useful instruction may be gathered from these words, that the world cannot for a moment stand, except as it is sustained by the favor and goodness of God; for we see what would immediately be, as soon as God manifests the signals of his judgment. Since the very solidity of mountains would be as snow or wax, what would become of miserable men, who are like a shadow or an apparition? They would then vanish away as soon as God manifested his wrath against them, as it is so in Psalms 39:0, that men pass away like a shadow. This comparison ought ever to be remembered by us whenever a forgetfulness of God begins to creep over us, that we may not excite his wrath by self-complacencies, than which there is nothing more pernicious. Burned, (212) then shall be the earth, and the world, and all who dwell on it

Mountains have shaken through him,
And hills have melted away;
And confounded has been the earth at his presence,
Yea, the world and all its inhabitants.