"Things are only impossible until they're not" Jean-Luc Picard, Star Trek: The Next Generation
It occurred to me when I read this quote that maybe that is why I like science fiction and fantasy. Those genres allow for possibilities not seen in the real world. No, dragons and elves are not going to show up on the streets of small town Wyoming, but reading and writing in the genres of science fiction and fantasy allow my imagination to roam into places otherwise impossible.
Another aspect of this quote is the meaning it lends to dreams (as in hopes and dreams). Dreams often require the belief that the impossible can become possible. One necessary component hinted at in the quote is the perseverance to see the dream through until it is reality. This can be a difficult task when your inner critic is screaming you're no good and it's not worth the effort. I don't know if it can be taught, but it seems the denial of reality that is characteristic of dreamers has to kick in at this point and drown out the critic. It doesn't have to say everything will turn out perfectly, but it has to remind a person that there is still hope. And so we go one, striving for the day when the impossible is not.