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
Business opportunities are like buses, there's always another one coming.
-- Richard Branson
Vision is perhaps our greatest strength... it has kept us alive to the power and continuity of thought.
-- Li Ka-shing
The public does not know what is possible, but we do.
-- Akio Morita
Think big, think fast, think ahead. Ideas are no one's monopoly.
-- Dhirubhai Ambani
I have always been delighted at the prospect of a new day, a fresh try, one more start.
-- Linus Pauling
Go as far as you can see; when you get there, you'll be able to see farther.
-- J. P. Morgan