A security system is only as secure as its secret. Beware of pseudo-secrets.

Lisp was far more powerful and flexible than any other language of its day; in fact, it is still a better design than most languages of today, twenty-five years later. Lisp freed ITS's hackers to think in unusual and creative ways. It was a major factor in their successes, and remains one of hackerdom's favorite languages.

Computer science education cannot make anybody an expert programmer any more than studying brushes and pigment can make somebody an expert painter.

When you lose interest in a program, your last duty to it is to hand it off to a competent successor.

If you have the right attitude, interesting problems will find you.

Equally, the Internet interprets attempts at proprietary control as threats and mobilizes to defeat them.

The next best thing to having good ideas is recognizing good ideas from your users. Sometimes the latter is better.