Isaiah 45:8

"Rejoice, O heavens, from above," that is, rejoice over the salvation of the nations. The angels are delighted at the repentance of a single sinner. "And the clouds will rain down righteousness." The clouds, which rain down righteousness, are the apostles and the priests who justify through the absolution, which they give by means of baptism. "Let the earth open, that salvation may be multiplied." Justice, symbolized through the earth, is poured on the mind of the nations, and salvation shall multiply in every region. "And let it cause righteousness to spring up also." In the salvation of the nations also their justice is multiplied, and salvation and justice spring up and grow at the same time.

"And let the clouds rain righteousness." On the occasion of making previous threats, he has said, "I will command the clouds to rain no rain on it," and … it was the prophets who were referred to in this way. Here, therefore, the text invites the prophets to present, as a kind of rain, the discourse dealing with righteousness. In fact, those recognized as prophets after the return from exile were Haggai, Zechariah and Malachi. "And let the earth bring forth and blossom with mercy, and bring forth righteousness likewise." For it is fitting likewise that the people who benefit from such watering offer fruits in consonance with the watering. Thus, the rain provides discourse regarding righteousness; therefore, he demands from them the fruits of righteousness and mercy. For he has called the people who inhabit the earth "the earth." "I am the Lord who created you." It is I who likewise from the beginning have brought you into existence.

(Chapter 45, Verse 8) Drop down, ye heavens, from above, and let the clouds rain the just: let the earth be opened, and bud forth the saviour, and let justice spring up together: I the Lord have created him. Septuagint: Let the heavens above rejoice, and let the clouds rain down righteousness: let the earth bring forth salvation, and let mercy spring up, and let justice bud together: I the Lord have created thee. There is a double interpretation of this passage. For some believe that it refers to the previous statements, and that when Cyrus the king releases the captives, heaven and earth rejoice: metaphorically, this signifies those who dwell in heaven and on earth. Others separate it from what has gone before, and consider this chapter to be the beginning of its own section, and to prophesy concerning the coming of the Lord, which is commanded to come with clouds, about which it was written above (in ch. V, 6): 'I will command the clouds that they rain not upon it,' that is, upon the vineyard of Israel; and concerning those to whom the truth of God has come, so that they may rain righteousness upon the world or righteousness; and let the earth open, and let it bring forth a Savior. Concerning whom it is sung in the Psalms: 'Truth has sprung from the earth, and righteousness has looked down from heaven' (Ps. LXXXIV, 12); or, according to the Septuagint: 'The earth has brought forth mercy and righteousness together,' so that both sinners may obtain mercy and the righteous may receive rewards. And furthermore, I, the Lord, who created him, or, I, the Lord who created you, shall not be scandalized by the name of the creature, who has read him to be a worm, a servant, and a plant sprung from the earth.