Facebook CEO Mark Zuckerberg returned to Harvard with a message on fighting inequality and taking risks in the name of innovation.

Zuckerberg, who, like the graduates, is a millennial, started Facebook in his Harvard dorm room in 2004. He dropped out the next year and returned Thursday to receive an honorary degree.

Excerpts from his speech:

“Let’s face it, you accomplished something I never could. If I get through this speech today, it’ll be the first time I actually finish something here at Harvard.”

“My best memory from Harvard is meeting Priscilla. I had just launched this prank website Facemash, and the ad (administrative) board wanted to ‘see me.’ Everyone thought I was going to get kicked out. My parents drove up here to help me pack my stuff. My friends threw me a going-away party. Who does that? As luck would have it, Priscilla was at that party with her friends. And we met in line for the bathroom in the Pfoho Belltower (a dorm), and in what must seem like one of the all-time most romantic lines, I turned to her and said: ‘I’m getting kicked out in three days, so we need to go on a date quickly.”‘

“Ideas don’t come out fully formed. They only become clear as you work on them. You just have to get started. If I had to know everything about connecting people before I got started, I never would have built Facebook.”

“It’s really good to be idealistic. But be prepared to be misunderstood. Anyone working on a big vision is going to get called crazy, even if you end up right.”

“There is something wrong with our system when I can leave here and make billions of dollars in 10 years while millions of students can’t even afford to pay off their loans, let alone start a business.”

“Every generation expands its definition of equality … And now it’s time for our generation to define a new social contract.”