"There are television sets in every home, every restaurant, every hotel room, every shopping mall-now they’re even small enough to carry in your pocket like electronic rosaries. It is an unquestioned part of everyday life. Kneeling before the cathode ray God, with our TV Guide concordance in hand, we maintain the illusion of choice by flipping channels (chapters and verses). It doesn’t matter what is flashing on the screen-all that’s important is that the TV stays on."

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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.

— Donald Knuth