1st Corinthians 9:21

18 What, then, is my reward? -- that proclaiming good news, without charge I shall make the good news of the Christ, not to abuse my authority in the good news;

19 for being free from all men, to all men I made myself servant, that the more I might gain;

20 and I became to the Jews as a Jew, that Jews I might gain; to those under law as under law, that those under law I might gain;

21 to those without law, as without law -- (not being without law to God, but within law to Christ) -- that I might gain those without law;

22 I became to the infirm as infirm, that the infirm I might gain; to all men I have become all things, that by all means I may save some.

23 And this I do because of the good news, that a fellow-partaker of it I may become;

24 have ye not known that those running in a race -- all indeed run, but one doth receive the prize? so run ye, that ye may obtain;