I'd rather be optimistic and wrong than pessimistic and right.

Entrepreneurs
Elon Musk
Born in South Africa in 1971, Elon Musk built the electronic-payments foundation with PayPal, then commercially established the electric-vehicle industry with Tesla and opened the era of private space transportation with SpaceX. Armed with 'first-principles thinking,' he simultaneously disrupts multiple giant industries — electric vehicles, rockets, solar energy, brain-computer interfaces — and is reshaping the 21st-century industrial map with his vision of Mars colonization.
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Elon Musk's Other Quotes
I think it is possible for ordinary people to choose to be extraordinary.
You want to be extra rigorous about making the best possible thing you can. Find everything that's wrong with it and fix it.
Failure is an option here. If things are not failing, you are not innovating enough.
When something is important enough, you do it even if the odds are not in your favor.
Related Quotes
I have always been delighted at the prospect of a new day, a fresh try, one more start.
-- Linus Pauling
Business opportunities are like buses, there's always another one coming.
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Go as far as you can see; when you get there, you'll be able to see farther.
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All I had at the beginning was a dream and groundless confidence. Everything started from there.
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Bringing happiness to people through the information revolution.
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Whether you think you can, or you think you can't -- you're right.
-- Henry Ford