The sermon is based on 1 Corinthians 9:19-23 (CEB)
19 Although I’m free from all people, I make myself a slave to all people, to recruit more of them. 20 I act like a Jew to the Jews, so I can recruit Jews. I act like I’m under the Law to those under the Law, so I can recruit those who are under the Law (though I myself am not under the Law). 21 I act like I’m outside the Law to those who are outside the Law, so I can recruit those outside the Law (though I’m not outside the law of God but rather under the law of Christ). 22 I act weak to the weak, so I can recruit the weak. I have become all things to all people, so I could save some by all possible means. 23 All the things I do are for the sake of the gospel, so I can be a partner with it.