It's our nature to take things for granted, its true we can't control it. Because no matter how many times we tell ourselves we mustn't take things for granted, there's always this little part in us that neglects it.
Similarly, we always don't see the meaning behind simple things. We overlook them. Just like a see-saw in the playground, why is it built? What's the purpose of sitting on a plank of wood that brings two person up and down?
Simple, the reason why see-saw made for two people is so that when you go down, there'll always be someone to lift you up again.