Have you ever heard the expresstion:
"Be greatful with what you have. You never know when you'll lose it."
It's a very important saying. For example:
You have this epic fight with your mother/father and you end up saying you hate them. Later that day, your mom/dad say they're going to the store. But on their way, they get into a car accendent and die. You'd feel like shit knowing the way your mom/dad will remember you saying you hate them. There are children who don't have loving parents like you. As a matter of fact, they don't even have parents, they're orpans.
Do you see how easly things can be taken away from you?
It's the same thing