Optimism, like hope, means having a strong expectation that, in general, things will turn out all right in life, despite setbacks and frustrations. From the standpoint of emotional intelligence, optimism is an attitude that buffers people against falling into apathy, hopelessness, or depression in the face of tough going. And, as with hope, its near cousin, optimism pays dividends in life (providing, of course, it is a realistic optimism; a too-naive optimism can be disastrous).

Daniel Goleman, Emotional Intelligence