The Yoga of Renunciation

Krishna describes the yogi's source of happiness: one whose self is unattached (asaktātmā) to external contacts (bāhya-sparśeṣu) finds (vindati) happiness (sukham) in the Self (ātmani). Such a person (saḥ), whose self is engaged in union with Brahman (brahma-yoga-yuktātmā), enjoys (aśnute) imperishable happiness (akṣayam sukham). This means the yogi doesn't depend on external objects for happiness—they find happiness within. External pleasures are temporary and depend on objects—the yogi finds happiness in the Self, which is imperishable. This is the practical outcome of karma yoga—happiness that doesn't depend on external circumstances.