橘生淮南则为橘橘生淮北则为枳
[jú shēng huái nán zé wéi jú jú shēng huái bĕi zé wéi zhĭ]
Derived from an ancient saying, 'Ju Sheng Huai Nan Ze Wei Ju Ju Sheng Huai Bei Ze Wei Zi,' means 'When orange grows south of Huai River it’s sweet, when it grows north of Huai River it's bitter'. It describes the influence of environment on a person's character.