Marcus Buckingham said this in his recent talk at Entreleadership event : any body who leads well is an optimist. They genuinely believe things will get better. And the problem is some leaders are pessimists, and the thing is, pessimists are right way more often than optimists are. But for goodness sake if you are a pessimist don’t lead.
Things will get hard, and people only follow you because you believe things can and will get better, that’s the only reason people follow you, and we love that about you and we want that from you.