Becoming all things to all people, means understanding where different people come from. Some like the Jews have a very long history with Yahweh, some may not now Yahweh but have deeply held religious traditions nevertheless, some are irreligious to the bone and yet others are controlled but by their beliefs but by their weaknesses. Apostle Paul is asking us to find common ground with all these people so that we might be able to win some of them for Christ.