Maturity is growing to the point where you think of others and give rather than thinking of yourself and consuming. And that's really what the discussion here in this passage is about. Are we staying individual immature people who look out for ourselves and fuss about how we're feeling or how we're being treated? Are we people who can put aside ourselves and follow Jesus in giving and investing and humbling ourselves to contribute, being willing to take wrong, to take the backseat if necessary?