21 And he set up the pillars in the porch of the temple: and he set up the right pillar, and called the name thereof Jachin: and he set up the left pillar, and he called the name thereof Boaz.
[The Scripture] calls the [pillar] on the south “Jachin,” indicating through it the humility of the priesthood; while the one on the north, called “Boaz,” signifies the power of kingship. It is possible that in Hebrew the two pillars indicate the two powers. The capitals at their top symbolize the power that is due to priests and kings and the weights of government, which are imposed on them. The sculptures, the lily work and the garlands of flowers signify the brightness and dignity of priesthood and kingship.
Booz: That is, in its strength. By recording these names in holy writ, the spirit of God would have us understand the invincible firmness and strength of the pillars on which the true temple of God, which is the church, is established.
[AD 850] Ishodad of Merv on 1 Kings 7:21