来而不往非礼也 (來而不往非禮也) lái ér bù wǎng fēi lǐ yě

lái ér bù wǎng fēi lǐ yě phrase not to reciprocate is against etiquette / to respond in kind
Domain: Literary Chinese 文言文
Notes: (CC-CEDICT '來而不往非禮也')