Confucius says

jǐsuǒbúyù wùshīyúrén

This is a saying from the Analects of Confucius. If you want to know more about it, here's the sentence explained. The first column is the text in classical Chinese, the second column (the coloured one) is the translation of the single characters in modern Chinese, and the third is the translation in English.

"Do not do to others

 what you do not like done to yourself"

                                                    (Confucius, Analects)