'Gain' in the Bible

For though I was free from all, I brought myself under bondage to all, that I might gain the more.

To the Jews I became as a Jew, that I might gain Jews; to those who are under the law, as under the law, that I might gain those who are under the law;

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