• Isa 40:3 — 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.
• Isa 40:4 — 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:
• Isa 40:5 — 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.

3 Christian traditions affirm this interpretation.

• Evangelical · Evangelical
• Patristic · Patristic
• Reformed · Reformed

8 passages from 6 historic works cite scripture this interpretation depends on.

• Commentary on the Gospel of John · 3 passages
• Catechism of the Catholic Church · 1 passage
• Homilies on Matthew · 1 passage
• Homilies on the Gospel of John · 1 passage
• Commentary on the Book of the Prophet Isaiah · 1 passage
• Commentary on the Gospel According to John · 1 passage