近朱者赤，近墨者黑

jìnzhūzhěchìjìnmòzhěhēi

近朱者赤，近墨者黑 — jìnzhūzhěchìjìnmòzhěhēi

1. Those who handle cinnabar are stained red; those who work with ink are stained black (idiom); you are the product of your environment.

   他常和乐观的人在一起，果然近朱者赤，性格也开朗了。 tā cháng hé lèguān de rén zài yìqǐ guǒrán jìnzhūzhěchì xìnggé yě kāilǎng le — He often spends time with optimistic people; as the proverb says, you are the product of your environment, and his personality became more cheerful.