Treasury of Scriptural Knowledge, by R.A. Torrey, [ca. 1880], at sacred-texts.com
It is generally supposed, that the prophet Joel blends two subjects of affliction in one general consideration, or beautiful allegory; and that, under the devastation to be produced by locusts in the vegetable world, he portrays the more distant calamities to be inflicted by the armies of the Chaldeans in their invasion of Judea. These predictions are followed by a more general denunciation of God's vengeance, delivered in such language as to be in some measure descriptive of the final judgment of mankind. The prophet intermingles these declarations with earnest exhortations to repentance, and with promises of returning prosperity productive of Gospel blessings; foretelling, in the clearest terms, the general effusion of the Holy Spirit under the Christian dispensation, and the awful consequences of obstinately rejecting the sacred influence, especially to the Jews. The state of this nation at the present day, fully attests the Divine inspiration of the prophecy.