त्यक्त्वा कर्मफलासङ्गं नित्यतृप्तो निराश्रयः।
कर्मण्यभिप्रवृत्तोऽपि नैव किञ्चित्करोति सः।।4.20।।
4.20 Having given up attachment to the results of action, he who is ever-contented, dependent on nothing, he really does not do anything even though engaged in action.
4.20 Whoever performs actions, renouncing attachment to their fruits and is satisfied with the eternal, i.e., satisfied with his own self, and dependent on none, i.e., devoid of dependence on transient Prakrti (body and external nature) - such a perosn, even though fully engaged in actions, does not act at all. He is engaged in the practice of knowledge under the form of action. Again, Karma, having the form of knowledge, is examined:
Tyaktwaa karmaphalaasangam nityatripto niraashrayah; Karmanyabhipravritto’pi naiva kinchit karoti sah.
tyaktvā—having given up; karma-phala-āsaṅgam—attachment to the fruits of action; nitya—always; tṛiptaḥ—satisfied; nirāśhrayaḥ—without dependence; karmaṇi—in activities; abhipravṛittaḥ—engaged; api—despite; na—not; eva—certainly; kiñchit—anything; karoti—do; saḥ—that person