Tao Te Ching · Ch. 46

天下有道,卻走馬以糞。天下無道,戎馬生於郊。禍莫大於不知足;咎莫大於欲得。故知足之足,常足矣。

Tiān xià yǒu dào, què zǒu mǎ yǐ fèn. Tiān xià wú dào, róng mǎ shēng yú jiāo. Huò mò dà yú bù zhī zú; Jiù mò dà yú yù dé. Gù zhī zú zhī zú, cháng zú yǐ.

When the world follows the Tao, swift horses are put to work hauling dung. When the world has lost the Tao, war-horses breed on the borderlands. No calamity is greater than not knowing what is enough; no fault greater than the desire to acquire. Therefore, the sufficiency of knowing sufficiency is an enduring sufficiency.

— Tao Te Ching 46

Source: Wang Bi edition (Chinese) + Hanyu Pinyin transliteration