Best way to succeed is to do things for the customer, not to the competition. Very few people buy a product in order to help you hurt the competition. To think otherwise is lunacy.

Accept diversity and don't take any crap.

"(Big name research firm) says our market will be $50 billion in 2010." Every entrepreneur has a few slides about how the market potential for his segment is tens of billions. It doesn't matter if the product is bar mitzah planning software or 802.11 chip sets. Venture capitalists don't believe this type of forecast because it's the fifth one of this magnitude that they've heard that day. Entrepreneurs would do themselves a favor by simply removing any reference to market size estimates from consulting firms.

Pursue joy, not happiness. This is probably the hardest lesson of all to learn. It probably seems to you that the goal in life is to be happy. Oh, you maybe have to sacrifice and study and work hard, but, by and large, happiness should be predictable.

Evangelism is selling a dream.

Smart, well-meaning people get it wrong when they start believing that the world owes them something and that the rules are different for them.

The two most important things about people on a revolutionary team are their ability and passion. Their educational level or work experience is meaningless--most of the engineers who did ground-breaking work of the Macintosh design didn't even graduate from college.