1 Corinthians 9:21-23

21to those who are without law, as without law (not being without law toward God, but under law toward Christ), that I might win those who are without law;

22to the weak I became as weak, that I might win the weak. I have become all things to all men, that I might by all means save some.

23Now this I do for the gospel’s sake, that I may be partaker of it with you.