Read Luke 3:1-6
3 It was the fifteenth year of the rule of the Emperor Tiberius; Pontius Pilate was governor of Judea, Herod was ruler of Galilee, and his brother Philip was ruler of the territory of Iturea and Trachonitis; Lysanias was ruler of Abilene, 2and Annas and Caiaphas were high priests. At that time the word of God came to John son of Zechariah in the desert. 3So John went throughout the whole territory of the River Jordan, preaching, “Turn away from your sins and be baptized, and God will forgive your sins.” 4As it is written in the book of the prophet Isaiah:
“Someone is shouting in the desert:
‘Get the road ready for the Lord;
make a straight path for him to travel!
5Every valley must be filled up,
every hill and mountain levelled off.
The winding roads must be made straight,
and the rough paths made smooth.
6The whole human race will see God’s salvation!’ ”
Verses 4-6 are a prophecy that Isaiah made about the return of the exiles in Babylon to their home in Jerusalem. Even though the people were home - they were not home yet. God had bigger plans - as John announces the coming of Jesus we learn about God coming to live with his people.