Elon Musk's Caltech Commencement Speech: Begins at 31:20 (video)
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http://commencement.caltech.edu/archive/2012_address
The address beings at 31:20, so make sure to skip ahead.
Some choice quotes:
> I'd like to thank you for leaving crazy person out of the description.
> I'm optimistic about the future of Earth — things will most likely be O.K.
> The United States is a nation of explorers, and people came here from other parts of the world ... It's a distillation of the spirit of human exploration.
> You guys are the magicians of the 21st century. Don't let anything hold you back ... Imagination is the limit ... go out there and create some magic.
> There's a lot more that must happen beyond this in order for humanity to become a space-faring civilization, ultimately a multi-planet species ... But it's imperative for the preservation of consciousness and civilization.
> [Caltech] helps you get your foot in the door ... After that, they hire you for what you can do.
> Back up the biosphere with planetary redundancy
> [I went] to Russia three times ... [to] buy a refurbished ICBM, because it was the best deal.
> I started SpaceX against the advice of everyone I talked to ... One person made me sit down and watch videos of rockets exploding.
> The thing about a rocket is the passing grade is 100% ... It's a huge relief. I still can't believe it actually happened. -> Launches succeeding.
> It's right on the border of impossible. -> Mars Landing