Well what keeps us ticking? Why do we continue being, i mean of course we all have our own reasons... whether it be family... or another sense of contribution that we feel we bring to this earth, but all of these things are just another way to say we have goals.
Again, whether it family or what, we need small goals throughout our lives to keep us going, to keep us attentive. I mean when are you really done? When you're retired? Does that mean you just go die? is that why people move to Florida? because its a comfortable place to lay your head down forever? We as people need a reason to get out of bed in the morning, we need an overall accomplishment to look forward to and to work for if we want to accomplish anything. Those stupid lines like "reach for the stars" are simply perfect to describe this, because even if its completely unimaginable to accomplish, at least "you'll fall in the cloud", that is your humanity.