पञ्चतंत्र - मित्रभेद - राजवल्लभः

प्रोक्तः प्रत्युत्तरं नाह विरुद्धं प्रभुणा च यः |
न समीपे हसत्युच्चैः स भवेद्राजवल्लभः ||

- पञ्चतंत्र, मित्रभेद

He will be liked by a king who will neither speak against him nor laugh loudly in his presence. [But that is not good always to be liked by such a king.]

- Panchatantra, Mitrabhedha