Typesetting be hard work: "the word "present" as a noun hyphenates differently than the same word as a verb"
Knuth on possible future changes to TeX and METAFONT: "Let us regard these systems as fixed points, which should give the same results 100 years from now that they produce today."
Following 3.0, Knuth wanted point release updates to follow the progression of π (the current version is 3.14159265). Knuth also declared that on his death, the version number should be permanently set to π. “From that moment on,” he ordained “all ‘bugs’ will be permanent ‘features.’”