Behold, I am the one who has laid as a foundation in Zion, a stone, a tested stone, a precious cornerstone, of a sure foundation. (Isa. 28:16 ESV)

In the sixth O Antiphon, Christ is called the King the nations long for. And he is the cornerstone of a new building. He is the king who gets his hands dirty forming a new people from clay. And he redeems us.

Rejoice!

O King of the nations, and their desire,
the cornerstone making both one:
Come and save the human race,
which you fashioned from clay.