Isaiah 40:4

4 Every valley will be lifted up, and every mountain and hill will be leveled; the uneven ground will become smooth, and the rough places a plain.

Isaiah 40:4 Meaning and Commentary

Isaiah 40:4

Every valley shall be exalted, and every mountain and hill
shall be made low
Which is not to be understood literally, but, as Kimchi says, parabolically and mystically: the meaning is, that in consequence of John's ministry, and our Lord's coming, such who were depressed and bowed down with the guilt of sin, and were low and humble in their own eyes, should be raised up and comforted; and that such who were elated with themselves, and their own righteousness, should be humbled; their pride and haughtiness should be brought down, and they treated with neglect and contempt, while great notice was taken of lowly minded ones; see ( Luke 14:11 ) and ( Luke 18:14 ) : and the crooked shall be straight and the rough places plain;
what before was dark and intricate in prophecy should now become clear; and such doctrines as were not so well understood should now become plain and easy.

Isaiah 40:4 In-Context

2 Speak tenderly to Jerusalem, and announce to her that her time of servitude is over, her iniquity has been pardoned, and she has received from the Lord's hand double for all her sins.
3 A voice of one crying out: Prepare the way of the Lord in the wilderness; make a straight highway for our God in the desert.
4 Every valley will be lifted up, and every mountain and hill will be leveled; the uneven ground will become smooth, and the rough places a plain.
5 And the glory of the Lord will appear, and all humanity will see [it] together, for the mouth of the Lord has spoken.
6 A voice was saying, "Cry out!" Another said, "What should I cry out?" "All humanity is grass, and all its goodness is like the flower of the field.
Holman Christian Standard Bible ® Copyright © 2003, 2002, 2000, 1999 by Holman Bible Publishers.  Used by permission.  All rights reserved.