不為五斗米折腰

Etymology
From the Book of Jin Volume 94 Biographies of Hermits and Recluses "Tao Qian" (《晉書·卷九四·隱逸傳·陶潛》)：

Idiom

 * 1) to not compromise one's integrity just to earn a small salary in a dead-end job; to not sacrifice one's ideals in order to make a living