Matthew 3:3

The voice of one crying in the wilderness. John was called a "voice", (1) because the whole man was a sermon; (2) because he would call not attention to himself as a person, but only to the Savior, whose way he had come to prepare. For the prophecy see Isa 40:3.

Prepare ye the way of the Lord. The messengers sent before the eastern kings prepared the way for the chariots and armies of their monarchs. A "king's highway" had to be carried through the open land of the wilderness, valleys filled up, and hills leveled. Interpreted in its spiritual application, the wilderness was the world lying in evil.

Make his paths straight. Roads that have not been properly directed at the beginning. So are the ways of men when no preparation has been made for the GREAT KING. When John cried, "Make his paths straight", he meant, "Stop your crooked ways".
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