It's only when we truly know and understand that we have a limited time on earth - and that we have no way of knowing when our time is up we will then begin to live each day to the fullest as if it was the only one we had.
When I was 15 I worked at a dry cleaner because I wanted Abercrombie & Fitch jeans. My mom told me I could have $20 jeans not $70 jeans unless I was willing to work for them. So I did!