As it is written in the book of the words of Isaiah the prophet, "The voice of one crying in the wilderness, 'Make ready the way of the Lord. Make his paths straight.
All flesh shall see the salvation of God ...  Isaiah's great prophecy should have alerted the Jews to the inclusion in God's plans of salvation for the Gentiles; but the leaders of the people were set adamantly against any such idea.  The chosen people were destined to find in this concept the impossibility of their accepting Christ, which resulted in their own rejection and judicial hardening.