maitrīkaruṇāmuditopekṣāṇāṃ sukhaduḥkhapuṇyāpuṇyaviṣayāṇāṃ bhāvanātaś cittaprasādanam [YS 1.33]

tatra sarvaprāṇiṣu sukhasaṃbhogāpanneṣu maitrīṃ bhāvayet. duḥkhiteṣu karuṇām. puṇyātmakeṣu muditām. apuṇyaśīleṣūpekṣām. evam asya bhāvayataḥ śuklo dharma upajāyate. tataś ca cittaṃ prasīdati. prasannam ekāgraṃ sthitipadaṃ labhate.