if you exercise daily, spending about 20 minutes each day, you will probably live about 10 year longer.
if you take one day from every week and sleep early instead of going clubbing, maybe you will live an extra 8 years, from not inhaling the cigarette smoke and the alcohol.
if you had spent the $50 tuition fee per month and worked harder for your exams, you would not have to repeat your school year and pay twice the amount of exams fee, instead of just $300 for once.
if you had spent an extra $0.20 each day for more vegetables, it might just save you $5000 medical fees when you grow old.

but if you work out the math, it all balances out. there are so many things that we human beings do, that are pointless. and what happens if i meet with an accident, causing me to lose my life, or lose sight, or a limb, or the ability to walk, which brings extreme inconvenience to my remaining days? would i have regretted not having played more, do the things that i really enjoy, or spent more time with my family and friends?

then it comes back to me again. as i think wider, i imagine the vastness of the universe. what's the point of knowing anything, having anything? damn.