But it shall be one day which shall be known to the LORD, not day, nor night: but it shall come to pass, that at evening time it shall be light.
But it shall be one day - a day altogether unique, different from all others (Maurer). Compare "one," i:e., unique, Song of Solomon 6:9; Jeremiah 30:7. Not as Henderson explains, 'one continuous day, without night' (Revelation 22:5,25): the millennial period (Revelation 20:3-7). For it is not until "evening time" that the "light" comes. Meantime, it shall not be such daylight as the sun produces, nor yet shall it be altogether "night," such as there is in the absence of the sun: there will be some light, but dim and uncertain twilight, corresponding to the state of mind in the world - "distress of nations with perplexity" (Luke 21:25). There shall be neither the joy of day nor the repose of night.
Which shall be known to the Lord. This truth restrains man's curiosity, and teaches us to wait the Lord's own time (Matthew 24:36).
Not day, nor night - answering to "not ... clear, nor dark" (Zechariah 14:6); not altogether daylight, yet not the darkness of night.
At evening time it shall be light toward the close of this twilight- like time of calamity "light" - yea, the full and everlasting effulgence of light-shall spring up to the elect remnant (Psalms 97:11; Psalms 112:4; Isaiah 30:26; Isaiah 60:19-20).