Day in day out, I try as much as possible to exhibit a good behaviour. I always copy positive attitude from people I meet and good manners is one of them. Somebody like @hpabiola. Maturity defines itself in you when you exhibit good behaviors and behave in a civilized manner in society. There is a say that goes "if you think safety is expensive try accident". If you want to become a good person, there's only one thing to do: copy the good things from people you meet or make friends with. Don't let society influence you negatively. Try to learn moral lessons.