Zhēnzhèng de péngyou jūnzǐ hé ér bù tóng, néng tǎnchéng de biǎodá bùtóng yìjiàn.
Real friends follow 'harmonious but not the same' - they can express different views honestly.
Tips
history
From the Analects 《论语·子路》: 君子和而不同，小人同而不和 (The gentleman harmonises without conforming; the petty man conforms without harmony.) Chinese diplomacy frequently invokes the phrase to describe its cultural and international ethic.
usage
和 = harmonious relations while keeping distinct views; 同 = sameness/conformity. Modern usage almost always cites it as a diplomatic or interpersonal principle.
