बोधिचर्यावतार - कृपालुः

पुण्येन कायः सुखितः पाण्डित्येन मनःसुखं ।
तिष्ठन् परार्थं संसारे कृपालुः केन खिद्यन्ते ॥

- बोधिचर्यावतार

By doing good deeds when living will keep us happy physically. Wisdom keeps us happy mentally. When one lives for the sake of others, no one can make him unhappy at any time.

- Bodhicharyavatara