"I'm convinced that sending people to Mars is so expensive that if you go once and bring the people back and then go again and bring the people back, we're eventually going to run out of money. But what if we send people the first time and they don't come back? What if they stay there?"

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People seem to have acquired the idea that they have the inalienable right to stroll through life without either having sweated, picked up anything heavy, worked hard, or eaten less than they wanted at every meal. This approach is, of course, wrong. And it has resulted in a lot of expensive, unattractive, and entirely preventable problems amongst people who seem puzzled about why things aren't going well.

— Mark Rippetoe