If you imagine someone with 100 percent determination and 100 percent intelligence, you can discard a lot of intelligence before they stop succeeding. But if you start discarding determination, you very quickly get an ineffectual and perpetual grad student.

When Facebook first started, and it was just a social directory for undergrads at Harvard, it would have seemed like such a bad startup idea, like some student side project.

If you really understand something, you can say it in the fewest words, instead of thrashing about.

Paul Graham Quotes