Many times we don't treasure what we have until it is too late.  We take a lot of things for granted.  I like fried oysters, but I didn't bother to eat it before I left Singapore (and Thailand).  So, for the two and a half years that I was in the States, I just had to keep thinking about my fried oysters without being able to do anything about it.  I didn't know how to make good fried oysters.  No restaurants sold the kind of fried oyters that I liked.  But you know there are many other things other than fried oysters that have been taken for granted - something like relationship.