I think the trick with knowledge is to “acquire it, and forget all except the perfume” - because it is noisy and sometimes drowns out one's own “brain voices”. The perfume part is important because it will help find the knowledge again to help get to the destinations the inner urges pick.

When the Mac first came out, Newsweek asked me what I [thought] of it. I said: Well, it's the first personal computer worth criticizing. So at the end of the presentation, Steve came up to me and said: Is the iPhone worth criticizing? And I said: Make the screen five inches by eight inches, and you'll rule the world.

When I first prepared this particular talk... I realized that my usual approach is usually critical. That is, a lot of the things that I do, that most people do, are because they hate something somebody else has done, or they hate that something hasn't been done. And I realized that informed criticism has completely been done in by the web. Because the web has produced so much uninformed criticism. It's kind of a Gresham's Law-bad money drives the good money out of circulation. Bad criticism drives good criticism out of circulation. You just can't criticize anything.

Every technology really needs to be shipped with a special manual - not how to use it but why, when, and for what.

In our society we have hard nerds and soft nerds. The hard nerds are the ones who used to have the slide rules at their belt; now they have calculators. The soft nerds are the ones who get violently ill whenever anybody mentions an integral sign.

The only way you can predict the future is to build it.

Most software today is very much like an Egyptian pyramid with millions of bricks piled on top of each other, with no structural integrity, but just done by brute force and thousands of slaves.