Bhagavad Gita 4.22

यदृच्छालाभसन्तुष्टो द्वन्द्वातीतो विमत्सरः।समः सिद्धावसिद्धौ च कृत्वापि न निबध्यते ॥४.२२॥

yadṛcchālābhasantuṣṭo dvandvātīto vimatsaraḥsamaḥ siddhāvasiddhau ca kṛtvāpi na nibadhyate

Content with what comes to him without effort, free from the pairs of opposites and envy, even-minded in success and failure, he acts yet is not bound.

गीता