Thinking negatively is much easier in short term circumstances but overall if you think positively you'll end up happier because you'll see the good in things and the opportunities to get you where you want to be. Negativity just holds you back and generally makes you a grumpier person whereas with positivity you're more inclined to actually getting farther and making yourself happy rather than expecting things to happen for you when you aren't putting your best foot forward. That being said, I'm not knocking negative people (I for one have actually used that same line of saying this way of thinking makes good things that happen pretty much a bonus) but I've noticed in others and in myself that when you're thinking positively you can make yourself pretty happy. Of course being positive isn't the easiest, especially when you have a tendency to doubt things and always see the bad before the good, but it's worthwhile.