Vice, in its true light, is so deformed, that it shocks us at first sight; and would hardly ever seduce us, if it did not at first wear the mask of some virtue.
Hope is a state of mind independent of the state of the world. If your heart's full of hope, you can be persistent when you can't be optimistic. You can keep the faith despite the evidence, knowing that only in so doing has the evidence any chance of changing. So while I'm not optimistic, I'm always very hopeful.