Verse 15
But if I tarry long, that thou mayest know how thou oughtest to behave thyself in the house of God, which is the church of the living God, the pillar and ground of the truth.
That thou mayest know how to behave — This is the scope of the epistle.
In the house of God — Who is the master of the family.
Which is — As if he had said, By the house of God, I mean the church.
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