1 Corinthians 9 (NIV)

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19Though I am free and belong to no man, I make myself a slave to everyone, to win as many as possible.
20To the Jews I became like a Jew, to win the Jews. To those under the law I became like one under the law (though I myself am not under the law), so as to win those under the law.
21To those not having the law I became like one not having the law (though I am not free from God's law but am under Christ's law), so as to win those not having the law.
22To the weak I became weak, to win the weak. I have become all things to all men so that by all possible means I might save some.
23I do all this for the sake of the gospel, that I may share in its blessings.
24Do you not know that in a race all the runners run, but only one gets the prize? Run in such a way as to get the prize.
25Everyone who competes in the games goes into strict training. They do it to get a crown that will not last; but we do it to get a crown that will last forever.
26Therefore I do not run like a man running aimlessly; I do not fight like a man beating the air.
27No, I beat my body and make it my slave so that after I have preached to others, I myself will not be disqualified for the prize.