Charles Spurgeon Commentary Isaiah 40:4

"Every valley shall be exalted, and every mountain and hill shall be made low; and the uneven shall be made level, and the rough places a plain:" — Isaiah 40:4 (ASV)

Every valley shall be exalted, and every mountain and hill shall be made low:

That is what must happen to you who are very great and highly exalted; you will have to be made low. But as for the lowly ones, they shall be exalted. It is in this way that God comes to His people, marching over hills that have been overthrown, and over valleys that have been filled up, and leveled to make a highway for the King.