Origen
Catena Aurea · Lukasevangelium 3
And he came into all the country about Jordan, preaching the baptism of repentance for the remission of sins; As it is written in the book of the words of Esaias the prophet, saying, The voice of one crying in the wilderness, Prepare ye the way of the Lord, make his paths straight. Every valley shall be filled, and every mountain and hill shall be brought low; and the crooked shall be made straight, and the rough ways shall be made smooth; And all flesh shall see the salvation of God.
For when Jesus had come and sent His Spirit, every valley was filled with good works, and the fruits of the Holy Spirit, which if thou hast, thou wilt not only cease to become a valley, but will begin also to be a mountain of God.