1 Corinthians 9:19-23

I am a free man, nobody's slave; but I make myself everybody's slave in order to win as many people as possible. While working with the Jews, I live like a Jew in order to win them; and even though I myself am not subject to the Law of Moses, I live as though I were when working with those who are, in order to win them. In the same way, when working with Gentiles, I live like a Gentile, outside the Jewish Law, in order to win Gentiles. This does not mean that I don't obey God's law; I am really under Christ's law. Among the weak in faith I become weak like one of them, in order to win them. So I become all things to all people, that I may save some of them by whatever means are possible. All this I do for the gospel's sake, in order to share in its blessings.