Charles Ellicott Commentary Isaiah 32:15

"until the Spirit be poured upon us from on high, and the wilderness become a fruitful field, and the fruitful field be esteemed as a forest." — Isaiah 32:15 (ASV)

Until the spirit be poured upon us from on high ... —There was, then, a fixed limit of the desolation then described. Isaiah dwelt, as Joel (Joel 2:28) had dwelt before him, on the outpouring of the Spirit which should sweep away the frivolities of a profligate luxury and lead to a nobler life. The effect of that outpouring is described in symbolic language which had been used before (see Note on Isaiah 29:17), the “wilderness” taking the place of Lebanon.