II. They comfort themselves with the doctrine of God's eternity, and the perpetuity of his government (v. 19): But thou, O Lord! remainest for ever. This they are taught to do by that psalm which is entitled, A prayer of the afflicted, Ps. cii. 27, 28. When all our creature-comforts are removed from us, and our hearts fail us, we may then encourage ourselves with the belief, 1. Of God's eternity: Thou remainest for ever. What shakes the world gives no disturbance to him who made it; whatever revolutions there are on earth there is no change in the Eternal Mind; God is still the same, and remains for ever infinitely wise and holy, just and good; with him there is no variableness nor shadow of turning. 2. Of the never-failing continuance of his dominion: Thy throne is from generation to generation; the throne of glory, the throne of grace, and the throne of government, are all unchangeable, immovable; and this is matter of comfort to us when the crown has fallen from our head. When the thrones of princes, that should be our protectors, are brought to the dust, and buried in it, God's throne continues still; he still rules the world, and rules it for the good of the church. The Lord reigns, reigns for ever, even thy God, O Zion!