Public school teachers are in much the same position as prison wardens. - Paul Graham

A programming language is for thinking of programs, not for expressing programs you've already thought of.

Number of users may not be the perfect test, but it will be very close. It’s what acquirers care about. It’s what revenues depend on. It’s what makes competitors unhappy. It’s what impresses reporters, and potential new users.

Money is a side effect of specialization. In a specialized society, most of the things you need, you can’t make for yourself. If you want a potato or a pencil or a place to live, you have to get it from someone else. How do you get the person who grows the potatoes to give you some? By giving him something he wants in return. But you can’t get very far by trading things directly with the people who need them.