Oh, right, it's also the sense of purpose, hopes, dreams... the things you can and are doing in society and the desire to continue those actions insofar as humanly possible.

In a way, it's why Americans are so fond of 'small talk' and idle-chatter in random places with random people, or on internet forums.

Because ALL social interactions, contribute. Some may mean more to some people than others, but for an equal amount, even those superficial interactions are enough incentive to do more.

At one point I had to write an essay, essentially justifying my existence, define my life-purpose, and outline my ambitions... caused such an emotional breakdown when my brain decided it couldn't remember anything eventful. 
-This prompted an intervention. Turns out I've done quite a bit even before I was merely 16 years old, and even then, people looked-up to me as their role-model.

"Do your best to be prepared to be unprepared. [url=https://www.youtube.com/watch?v=HBLvgHQYg2c]I'm not dead yet[/url], so try to keep up."
-That work ethic is pretty infectious.

[url=https://www.youtube.com/watch?v=9ALOI63X_CE]If you're brave enough to take your life without flinching, you're brave enough to take it on.[/url]