I would say most of all, maturity makes a person stable. Once you grow up, you become stable- whether or not you are married. For instance a 18 year old is not going to become stable simply because they are married, it takes time to get the kind of wisdom to stabilize yourself. Marriage does not settle you down or make your life more stable. You do on your own.
Is what you're living for today, worth dying for tomorrow?
I just spoke up when you said marriage is what makes a man and woman stable. That is false, it is the relationship that does it and you can't get past that truth.