I just finished reading this, Larry Page's commencement speech given at the University of Michigan.  My favorite part is below.  These are wise words, and the whole thing is worth a read (and shorter than a lot of commencement speeches I've read).  The best part of the speech is really the end.  You'll have to read the whole thing to see what I mean.

When I was here at Michigan, I had actually been taught how to make dreams real! I know it sounds funny, but that is what I learned in a summer camp converted into a training program called Leadershape. Their slogan is to have a "healthy disregard for the impossible". That program encouraged me to pursue a crazy idea at the time: I wanted to build a personal rapid transit system on campus to replace the buses. It was a futuristic way of solving our transportation problem. I still think a lot about transportation -- you never loose a dream, it just incubates as a hobby. Many things that people labor hard to do now, like cooking, cleaning, and driving will require much less human time in the future. That is, if we "have a healthy disregard for the impossible" and actually build new solutions. I think it is often easier to make progress on mega-ambitious dreams. I know that sounds completely nuts. But, since no one else is crazy enough to do it, you have little competition. There are so few people this crazy that I feel like I know them all by first name. They all travel as if they are pack dogs and stick to each other like glue. The best people want to work the big challenges. That is what happened with Google. Our mission is to organize the world's information and make it universally accessible and useful. How can that not get you excited? But we almost didn't start Google because my co-founder Sergey and I were too worried about dropping out of our Ph.D. program. You are probably on the right track if you feel like a sidewalk worm during a rainstorm! That is about how we felt after we maxed out three credit cards buying hard disks off the back of a truck. That was the first hardware for Google. Parents and friends: more credit cards always help. What is the one sentence summary of how you change the world? Always work hard on something uncomfortably exciting! As a Ph.D. student, I actually had three projects I wanted to work on. Thank goodness my advisor said, "why don't you work on the web for a while". He gave me some seriously good advice because the web was really growing with people and activity, even in 1995! Technology and especially the internet can really help you be lazy. Lazy? What I mean is a group of three people can write software that millions can use and enjoy. Can three people answer the phone a million times a day? Find the leverage in the world, so you can be more lazy! Overall, I know it seems like the world is crumbling out there, but it is actually a great time in your life to get a little crazy, follow your curiosity, and be ambitious about it. Don't give up on your dreams. The world needs you all!

via Google Press Center: Larry Page Commencement Speech at the University of Michigan. UPDATE:  Here's a video of the speech: