But I discipline my body and keep it under control, lest after preaching to others I myself should be disqualified.

But I discipline my body and bring it into subjection, lest, when I have preached to others, I myself should become disqualified.
I discipline my body like an athlete, training it to do what it should. Otherwise, I fear that after preaching to others I myself might be disqualified.
But I punish my body and enslave it, so that after proclaiming to others I myself should not be disqualified.
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