Matthew 10:34

Think not that I am come to send peace on earth. Christ has to conquer a peace by overcoming the evil that is in the way of peace. Hence, to preach the gospel of purity and peace always arouses the opposition of the evil doer. Evil has to be put down before peace can prevail. Hence, while the great end that Christ proposes is peace, the immediate result of his coming, and of the preaching of the gospel, was opposition and bloodshed.

But a sword. The only sword that Christ or his followers use in the conflict is the Sword of the Spirit, but the persecutor has in every age turned upon them the carnal sword. The sword is sent because persecutors use it upon the church.
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