Perhaps, that is the least reliable, though. Don't you have examples around you that "business trade-off" does not work?
В жизни нет гарантий, это уж точно!

That's exactly what I'm trying to say here. To take care of your children is exactly like taking care of yourself. Your children are you. Like your own limb. It's an instinct. When you have a child, you'll know.
Не прав, они различные бытия

To draw some kind of analogy you might understand at this point in your life, if you love your boyfriend, won't you do stuff to him which he likes? That would be taking care of him and not of you, so why would you do that? Because you would like that too. Obviously, if you don't love the guy you wouldn't want to do the stuff..
Конечно, но это просто обмен.

Well, you might well be quiet, but won't you make people around you miserable when you're not in the mood? Maybe some other ways..
Некогда! Я не такая девушка, я держу свои проблемы при себе.