This photo helped me a lot: http://upload.wikimedia.org/wikipedia/commons/7/73/Pale_Blue_Dot.png

I believe that understanding of the insignificance of everything and the nothingness of death are two major milestones in personal philosophy. Don't let religious nonsense about afterlife, reincarnation, etc get you there.

The first one reveals how ridiculous are people, lets you poke fun at them and improves the mood in general. The latter one gives you an ability to judge whenever the life sucks big enough to be done with it.