世界最肮脏的莫过于自尊心
[shì jiè zuì āng zàng de mò guò yú zì zūn xīn]
Translates as 'The world’s dirtiest thing is self-respect/vanity.' It critically comments on how pride or vanity, despite often seen as positive, could be the dirtiest emotion when it leads people to act hypocritically.