"All mankind is one volume. When one man dies, a chapter is not torn out of the book, but translated into a better language. And every chapter must be translated. God employs several translators; some pieces are translated by age, some by sickness, some by war, some by justice. But God's hand shall bind up all our scattered leaves again for that library where every book shall live open to one another"

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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