The sword changes from household conflict to creation
the Son of God came not with peace but with a sundering sword
The wording points to Matthew 10:34–39: in the King James Version Jesus brings a sword rather than peace, and the following verses describe conflict within a household and the cost of allegiance to him. Luke 12:51–53 supplies a close parallel using 'division' rather than 'sword'. Chesterton's 'sundering sword' is thus an interpretive paraphrase, not an exact quotation. His initial explanation—that preaching love can provoke hatred—relates the metaphor to a preacher's reception, although Matthew's immediate concern is the priority of discipleship over family loyalty. Matthew and Luke, KJV.
Chesterton then deliberately gives the sword another meaning: the Father's creation of distinct persons makes love possible. Neither Gospel passage says that God creates souls by a sword, or that brothers must hate for an æon before ultimately loving. Those are Chesterton's metaphysical extension of the image. The movement matters: the division caused by the Son's mission is painful and historical; the division attributed to the Father is the enduring distinction that enables relationship. The paragraph turns a saying about conflict into an argument for the goodness of personal difference.
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