Some questions to think about.

You mean, from the perspective of the article? I don't agree with it (which isn't to say I disagree with it, either), but I'd like to answer those questions to explore the mindset.

How does it enable you to serve your fellow man?

You dedicate yourself to a cause, whether it's Jesus' teachings, a charity or even a software company's mission to better the world through their best means. As such, you succeed in improving lives of fellow men to whom you deliver your work.

How does it enable you to expand yourself?

In dedication to the cause, you learn how to be a better person to deliver your work. In the adventures that (usually) surround following a mission, you end up meeting people you wouldn't have met otherwise, and they can give you perspective that's priceless because it wouldn't have arrived to you any other way.

That said, one's self is irrelevant in the equation. One is but a vessel for the idea of making things better.

How does it enable you to examine and survive the difficulties of life?

By dedicating yourself to the cause, you find purpose. With purpose, many difficulties become much more bearable because in the end, you know you're going to achieve something great.

I'd love to hear your thoughts on the matter.