John said, "I am the voice of one shouting in the wilderness, 'Make straight the way for the Lord,' as Isaiah the prophet said."

so that the word of Isaiah the prophet would be fulfilled. He said, "Lord, who has believed our message, and to whom has the arm of the Lord been revealed?"

For this reason they could not believe, because again Isaiah said,

Isaiah said these things because he saw Christ's glory, and spoke about him.