Bhagavad Gita · Chapter 3: The Path of Action
Bhagavad Gita 3.7
यस्त्विन्द्रियाणि मनसा नियम्यारभतेऽर्जुन ।
कर्मेन्द्रियैः कर्मयोगमसक्तः स विशिष्यते ॥
yastvindriyāṇi manasā niyamyārabhate'rjuna | karmendriyaiḥ karmayogamasaktaḥ sa viśiṣyate ||
But one who controls the senses with the mind, Arjuna, and engages the organs of action in the yoga of action without attachment, is superior.
Modern context
The better way is the reverse of the last verse: the mind is disciplined and the hands are busy. Inwardly collected, outwardly fully engaged, and not clinging to the result. This is karma yoga in a single sentence, and it can be practised in any honest occupation.