II. How the kingdom of glory shall be introduced by the universal change of nature, v. 30, 31. The pouring out of the Spirit will be very comfortable to the righteous; but let the unrighteous hear this, and tremble. There is a great and terrible day of the Lord coming, which shall be ushered in with wonders in heaven and earth, blood, and fire, and pillars of smoke, the turning of the sun into darkness and the moon into blood. This is to have its full accomplishment (as the learned Dr. Pocock thinks) in the day of judgment, at the end of time, before which these signs will be performed in the letter of them, yet so that it was accomplished in part in the death of Christ (which is called the judgment of this world, when the earth quaked and the sun was darkened, and a great and terrible day it was), and more fully in the destruction of Jerusalem, which was a type and figure of the general judgment, and before which there were many amazing prodigies, besides the convulsions of states and kingdoms prophesied of under the figurative expressions of turning the sun into darkness and the moon into blood, and the wars and rumours of wars, and distress of nations, which our Saviour spoke of as the beginning of these sorrows, Matt. xxiv. 6, 7. But before the last judgment there will be wonders indeed in heaven and earth, the dissolution of both, without a metaphor. The judgments of God upon a sinful world, and the frequent destruction of wicked kingdoms by fire and sword, are prefaces to and presages of the judgment of the world in the last day. Those on whom the Spirit is poured out shall foresee and foretel that great and terrible day of the Lord, and expound the wonders in heaven and earth that go before it; for, as to his first coming, so to his second, all the prophets did and do bear witness, Rev. x. 7.