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1 Corinthians 9:24-27: 24Do you not know that in a race the runners all compete, but only one receives the prize? Run in such a way that you may win it. 25Athletes exercise self-control in all things; they do it to receive a perishable wreath, but we an imperishable one. 26So I do not run aimlessly, nor do I box as though beating the air; 27but I punish my body and enslave it, so that after proclaiming to others I myself should not be disqualified.
Here is the sermon: The Greatest Show On Earth