Your time is limited, so don't waste it living someone else's life. Don't be trapped by dogma — which is living with the results of other people's thinking. Don't let the noise of others' opinions drown out your own inner voice. And most important, have the courage to follow your heart and intuition. They somehow already know what you truly want to become. Everything else is secondary."
- Steve Jobs
Quotes like this get me thinking back to my fascination reading about Cognitive Dissonance in Psych 101.
That doesn't explain self-sacrifice. And, honestly, I wouldn't want to live an "eternal" life when everybody I love and know around me would be dead at some point or another. Maybe this is also why I've come to see Christianity's "promise" of eternal life as ridiculous and almost scary at times.
As Seneca used to say, it doesn't matter how long you live, it's what you do with your life that matters (http://en.wikipedia.org/wiki/De_Brevitate_Vitae_%28Seneca%29)
""" The philosopher brings up many Stoic principles on the nature of time, namely that men waste much of it in meaningless pursuits. According to the essay, nature gives man enough time to do what is really important and the individual must allot it properly. """
And to finish in an even more pathetic tone, I don't think we should strive for living an eternal life, but rather do what Julius Caesar did when he realized that Alexander had already conquered the world by 30: weep, and then try to conquer the world by ourselves.