Commentaries:
Jamieson, Fausset, and Brown
The voice—the same divine herald as in Isaiah 40:3.
he—one of those ministers or prophets (see on Isaiah 40:1) whose duty it was, by direction of "the voice," to "comfort the Lord's afflicted people with the promises of brighter days."
All flesh is grass—The connection is, "All human things, however goodly, are transitory: God's promises alone steadfast" (Isaiah 40:8, Isaiah 40:15, Isaiah 40:17, Isaiah 40:23-24); this contrast was already suggested in Isaiah 40:5, "All flesh . . . the mouth of the Lord." I Peter 1:24-25 applies this passage distinctly to the gospel word of Messiah (compare John 12:24; James 1:10).
Other Jamieson, Fausset, and Brown entries containing Isaiah 40:6:
Psalms 103:15-16
Isaiah 37:27
Isaiah 40:3
Isaiah 40:7
Isaiah 44:7
Isaiah 51:6
Isaiah 51:12
Jonah 1:2
Zechariah 1:14
John 1:14
1 Corinthians 1:29
James 1:11
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