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त्यक्त्वा कर्मफलासङ्गं नित्यतृप्तो निराश्रय: ।
कर्मण्यभिप्रवृत्तोऽपि नैव किञ्चित्करोति स:  ॥

tyaktvā karma-phalāsaṅgaṃ nitya-tṛpto nirāśraya:
karmaṇy-abhipravṛtto’pi naiva kiñcit-karoti sa: – 4.20 

Leaving the delusional clinging to the results of karma, ever content, free of expectation, the one who engages in activities, verily does not do anything; he remains a non-doer.