The quote in question comes from
Isaiah 40:3. It originally was part of the description of the escape from the
Babylonian Captivity. This same verse is quoted in
Mark 1:3 and
Luke 3:4. In Mark it is preceded by two other Old Testament quotes, Matthew moves these to
11:10. All three use the
Septuagint version of Isaiah with one slight rewording. Where Isaiah has "make straight paths for God" becomes "make straight paths for him". The author of Matthew does not introduce this quote with his standard "so it might be fulfilled" construction.
Gundry argues that this was because while a figure like John the Baptist could complete a prophecy, only Jesus could fulfill them. Hill notes that there are two main ways of punctuating this verse, which give somewhat different meanings. Traditionally the start of the quote was left as one phrase reading "the voice of one crying in the wilderness..." Based on the original Hebrew most modern scholars feel it should be two phrases reading "the voice of one crying: "In the wilderness..." This second punctuation makes the link between John the [Baptist] and Isaiah somewhat less direct. ==Commentary from the Church Fathers==