Breaking with old friends is one of the most painful of the changes in all that piling up of a multitude of small distasteful changes that constitutes growing older.
(John Dos Passos (1896-1970), U.S. novelist, poet, playwright, painter. The Ground We Stand On: Some Examples From the History of a Political Creed, sec. III, "On the White Porch of the Republic," ch. 5, "Citizen Barlow of the Republic of the World," Harcourt, Brace and Company (1941).)
For some natures, changing their opinions is just as much a requirement of cleanliness as changing their clothes: for others, however, it is merely a requirement of vanity.
(Friedrich Nietzsche (1844-1900), German philosopher, classical scholar, critic of culture. Friedrich Nietzsche, Sämtliche Werke: Kritische Studienausgabe, vol. 2, p. 701, eds. Giorgio Colli and Mazzino Montinari, Berlin, de Gruyter (1980). The Wanderer and His Shadow, aphorism 346, "A Requirement of Cleanliness," (1880).)