Isaiah 45:8

It is from heaven, from above the skies, that righteousness drops down, for every grace and good gift is from above; nay, since the more plentiful effusion of the Spirit it is now poured down, and, if our hearts be open to receive it, the product will be the fruits of righteousness and the great salvation.

Drop down, ye heavens - The eighty-fifth psalm is a very elegant ode on the same subject with this part of Isaiah’s prophecies, the restoration of Judah from captivity; and is, in the most beautiful part of it, a manifest imitation of this passage of the prophet: - “Verily his salvation is nigh unto them that fear him, That glory may dwell in our land. Mercy and truth have met together; Righteousness and peace have kissed each other. Truth shall spring from the earth, And righteousness shall look down from heaven.

MAURER translates, "Let all kinds of salvation (prosperity) be fruitful" (Ps 72:3, 6, 7). The revival of religion after the return from Babylon suggests to the prophet the diffusion of Messiah's Gospel, especially in days still future; hence the elevation of the language to a pitch above what is applicable to the state of religion after the return.

Drop down, ye heavens, from above - That is, as a result of the benefits that shall follow from the rescue of the people from their captivity and exile. The mind of the prophet is carried forward to future times, and he sees effects from that interposition, as striking as if the heavens should distil righteousness; and sees the prevalence of piety and happiness as if they should string out of the earth. It may be designed primarily to denote the happy results of their return to their own land, and the peace and prosperity which would ensue. But there is a beauty and elevation in the language which is better applicable to the remote and distant consequences of their return - the coming and reign of the Messiah. The figure is that of the rain and dew descending from heaven, and watering, the earth, and producing fertility and beauty; and the idea is, that piety and peace would prevail in a manner resembling the verdure of the fields under such rains and dews. A figure remarkably similar to this is employed by the Psalmist Psa 85:11-12: Truth shall spring out of the earth; And righteousness shall look down from heaven. Yea, the Lord shall give that which is good - And our land shall yield her increase. The phrase, ‘drop down, ye heavens, from above,’ means, pour forth, or distil, as the clouds distil, or drop down the rain or dew Psa 45:12-13. It is appropriately applied to rain or dew, and here means that righteousness would be as abundant as if poured down like dews or showers from heaven. The Septuagint however, render it, ‘Let the heavens above be glad,’ but evidently erroneously. And let the skies - The word used here (שׁחקים shechaqiym) is derived from the verb שׁצק shâchaq, “to rub,” pound fine, or beat in pieces; and is then applied to dust (see Isa 40:15); to a thin cloud; a cloud of dust; and then to clouds in general Job 36:28; Job 37:18; Job 38:37. […]