[sleep-less]

Willpower is the greatest force in our world and 99.999999% of us have a limited quantity of it. Drugs, alcohol, tobacco addiction; overeating and lack of exercise; not working or studying hard enough. Are you really trying to say anybody can overcome those by "doing and completing something because its important to you"?

[JacobJans]

Actually, if something is important enough to someone, they are always motivated to do it. Period. No tricks needed. Of course, it's not often in life that one finds things that are that important. Some people never find such things. And that is sad, and sadly common.

[Houshalter]

Clearly you have never had to deal with procrastination.

[Spearchucker]

Note that I'm no scientist so I only have my personal belief to go by. Yes. If its important enough, I believe anyone can.