Commentaries:
Jamieson, Fausset, and Brown
Eastern monarchs send heralds before them in a journey to clear away obstacles, make causeways over valleys, and level hills. So John's duty was to bring back the people to obedience to the law and to remove all self-confidence, pride in national privileges, hypocrisy, and irreligion, so that they should be ready for His coming (Malachi 4:6; Luke 1:17).
crooked—declivities.
Other Jamieson, Fausset, and Brown entries containing Isaiah 40:4:
Psalms 84:5
Ecclesiastes 1:15
Isaiah 26:7
Isaiah 35:8
Isaiah 45:2
Isaiah 49:11
Isaiah 57:14
Zechariah 4:7
Zechariah 14:10
Malachi 3:1
Revelation 17:9
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