"The strongest thing to cultivate as an entrepreneur is to not need to rely on luck but to recognize fortunate situations when they're occurring." - Jack Dorsey
"The best time to innovate or start something new is in the midst of a recession or depression." (speaking about launching Square during the 2008 financial downward spiral.)
Make sure to listen to the passion with which he describes the Golden Gate Bridge at the 21:50 mark. It is something that shouldn't exist but does and does so beautifully.