If your opponent proposes an alteration, you can call it an innovation, as this is an invidious word. If you yourself make the proposal, it will be the converse. In the first case, you can call the antagonistic principle "the existing order," in the second, "antiquated prejudice." (...) This is, at bottom, a subtle petitio principii. What is sought to be proved is, first of all, inserted in the definition, whence it is then taken by mere analysis.— Arthur Schopenhauer, The Art of Controversy, Stratagem XII (posthumous, 1896)