都是水何必装纯都是狼何必装羊
[dōu shì shuĭ hé bì zhuāng chún dōu shì láng hé bì zhuāng yáng]
Translates to 'Being all water, why pretend to be pure? Being all wolves, why pretend to be sheep?'. The saying sarcastically questions why people who are already impure (or deceitful) pretend otherwise, suggesting that one might as well embrace their true nature rather than pretend to be innocent or virtuous.