"I am the voice," he replied, "of one crying aloud, 'Make straight the Lord's way in the Desert,' fulfilling the words of the Prophet Isaiah."

in order that the words of Isaiah the Prophet might be fulfilled, "Lord, who has believed our preaching? And the arm of the Lord--to whom has it been unveiled?"

For this reason they were unable to believe--because Isaiah said again,

Isaiah uttered these words because he saw His glory; and he spoke of Him.