Gita 04.21 explained
Bg 4.21 nirāśīr yata-cittātmā tyakta-sarva-parigrahaḥ śārīraṁ kevalaṁ karma kurvan nāpnoti kilbiṣam Synonyms: nirāśīḥ — without desire for the result; yata — controlled; citta-ātmā — mind and intelligence; tyakta — giving up; sarva — all; parigrahaḥ — [...]