There is probably nothing rightly thought or rightly written on this matter of love that is not a piece of the person’s experience.
关于爱情,凡真正想得明白、写得贴切的,大概都出自当事人的亲身经历。
— Robert Louis Stevenson · Virginibus Puerisque, and Other Papers · Virginibus Puerisque · III · On Falling in Love —