Bhagavad Gita · Chapter 18: Freedom through Renunciation
Bhagavad Gita 18.23
नियतं सङ्गरहितमरागद्वेषतः कृतम् ।
अफलप्रेप्सुना कर्म यत्तत्सात्त्विकमुच्यते ॥
niyataṃ saṅgarahitamarāgadveṣataḥ kṛtam | aphalaprepsunā karma yattatsāttvikamucyate ||
An action that is required, and that is done without attachment, without attraction or aversion, by one who does not seek its fruit, is said to be of clarity.
Modern context
Sattvic action is what needs to be done, done without attachment, without liking or disliking it, by someone who does not seek reward. This is the kind of action the whole Gita has been describing. It is quiet, steady and clean. It does not make a fuss. It simply does what is required, well, and lets go.