[3] The voice of him that crieth in the wilderness, Prepare ye the way of the LORD, make straight in the desert a highway for our God. [4] Every valley shall be exalted, and every mountain and hill shall be made low: and the crooked shall be made straight, and the rough places plain: [5] And the glory of the LORD shall be revealed, and all flesh shall see it together: for the mouth of the LORD hath spoken it.
Isaiah 40:3-5
Explanation
The book of Isaiah can be divided much like the Bible itself. In the Old Testament there are 39 books, and in the New Testament there are 27 books, for a total of 66 books. The book of Isaiah has 66 chapters—39 that seem to represent the Old Testament and 27 that seem to represent the New Testament.
The beginning of chapter 40 speaks of one who is coming with a message: this voice that cries in the wilderness. It’s a prophecy about John the Baptist and the message that he proclaimed. Some may say it’s a self-fulfilling prophecy in the sense that while he was just proclaiming the message that was written down, he was assuming the identity of the person described in Isaiah 40. The problem is that the message he was giving was also accomplishing what actually happened.
He literally did prepare the way of the Lord. He really was someone that lived in the desert, and he did prepare people for the coming of Jesus Christ. Verse 4 says every valley will be exalted, every mountain shall be made low—talking about an evening of the way. Going uphill is hard, going down through a valley could be hard, but having this straight path, this clear path through which the Messiah could come, through which God could come, and the glory of the Lord through the Son of God to be revealed—that’s what John was doing. That’s what actually happened.
He was a foreteller and a forerunner of Jesus. The truth of the matter is, the glory of God was revealed through Jesus. In the end, everyone will know that Jesus is Lord. In fact, that’s what Philippians tells us: that every knee will bow and every tongue will confess that Jesus Christ is Lord to the glory of God the Father. God’s gonna make this happen.
This is a prophetic passage that foretells what would happen with John and what would happen through God coming behind John—at least in timing and in messaging—through the person of Jesus Christ.
Application
The implication is that this is a sign that helps us understand that Jesus is who He said He was. It’s not the last sign or even the most prominent sign—Jesus’ resurrection from the dead helps us know that He was who He said He was as well—but it’s a picture. It’s a sign for us to know that John is exactly who Scripture said he was, and this was his message, and this was his ministry.
It’s pretty amazing how the Bible all works together. You can trust your Bible. Its prophecies come true. While not every prophecy has been fulfilled, many of them have, and they tell us—they witness to us—that every prophecy will be fulfilled because what God says He will do, He will do. The Lord has spoken it. The mouth of the Lord has spoken it.
Response
- Where are you having a hard time trusting God and trusting God’s Word? What can you do to deepen your trust in His Word?
- Is your ministry—is your service for the Lord—based on confidence in the Word of God, or is it based on your own effort?



