Random numbers should not be generated with a method chosen at random

Programming is legitimate and necessary academic endeavour.

I define UNIX as 30 definitions of regular expressions living under one roof.

The important thing, once you have enough to eat and a nice house, is what you can do for others, what you can contribute to the enterprise as a whole.

When certain concepts of TeX are introduced informally, general rules will be stated; afterwards you will find that the rules aren't strictly true. In general, the later chapters contain more reliable information than the earlier ones do. The author feels that this technique of deliberate lying will actually make it easier for you to learn the ideas. Once you understand a simple but false rule, it will not be hard to supplement that rule with its exceptions.

Beware of bugs in the above code; I have only proved it correct, not tried it.

Meta-design is much more difficult than design; it's easier to draw something than to explain how to draw it.