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
When something is important enough, you do it even if the odds are not in your favor.
I think it is possible for ordinary people to choose to be extraordinary.
Failure is an option here. If things are not failing, you are not innovating enough.
You want to be extra rigorous about making the best possible thing you can. Find everything that's wrong with it and fix it.
Related Quotes
Whether you think you can, or you think you can't -- you're right.
-- Henry Ford
Think big, think fast, think ahead. Ideas are no one's monopoly.
-- Dhirubhai Ambani
The public does not know what is possible, but we do.
-- Akio Morita
Business opportunities are like buses, there's always another one coming.
-- Richard Branson
You become what you believe.
-- Oprah Winfrey
Vision is perhaps our greatest strength... it has kept us alive to the power and continuity of thought.
-- Li Ka-shing