The very flexibility and ease which make men’s friendships so agreeable while they endure, make them the easier to destroy and forget.
友谊存在时之所以令人愉快,正是因为它灵活而轻松;也正因如此,它更容易破裂和被遗忘。
— Robert Louis Stevenson · Virginibus Puerisque, and Other Papers · Virginibus Puerisque · I —