Ambition and Expectation

I'm very interested in the polarity between ambition and expectation. On one hand to be ambitious is to be confident, to be strong, to have faith. With that comes a sense of hope, expectation that good fortune persevere. Dennis Prager is quoted with saying: > The more expectations you have, the less gratitude you will have. Can you be ambitious and not have expectations? Is being ambitious a bad thing? Are expectations the root of unhappiness? Alternatively, is it how we handle failure or disappointment when things don't go according to plan that is what creates unhappiness?