There’s no right answer. The present self usually wins, because he controls the action and so his interests are more important. But the future self actually has a stronger case: he’s actually a bunch of future selves (you in 10 minutes from now, an hour from now, a day from now, three days from now, a year later, and so on). So shouldn’t a thousand future selves outweigh the current self’s interest?

~ Leo Babauta from, http://zenhabits.net/mmm-ouch/

Not claiming I have this one all figured out. Just claiming you should read everything Leo writes…