Theodoret of Cyrus : He accordingly bids the barren one to fill the world with houses of prayer and to make them left and right, that is to say, in the south and the north. One is not, however, mistaken if one gives the name of "stakes" to the holy prophets, to the apostles and to the martyrs, hidden in the earth, as the tent stakes are; these are the ones who maintain the tabernacle of the church, holding it upright with their doctrines as if with ropes. They are also called "foundations." — COMMENTARY ON Isaiah 17:54.2