When I look at the world, do I compare what I see to the reality I want for myself, or the reality I want for others? I'd wager your answer to this fundamentally shapes how you think and approach life.
But this isn't to say your answer can't change. The event that I see most consistently inspire a re-evaluation is a father laying eyes on his first born for the first time, when he goes from self to self-less.
When you take care of the who, it seems the what, where, when, and why more naturally fall into place.