Bhagavad Gita · Chapter 2: The Path of Understanding
Bhagavad Gita 2.50
बुद्धियुक्तो जहातीह उभे सुकृतदुष्कृते ।
तस्माद्योगाय युज्यस्व योगः कर्मसु कौशलम् ॥
buddhiyukto jahātīha ubhe sukṛtaduṣkṛte | tasmādyogāya yujyasva yogaḥ karmasu kauśalam ||
One whose understanding is disciplined leaves behind both good and bad deeds in this very life. So devote yourself to yoga. Yoga is skill in action.
Modern context
'Yoga is skill in action.' The skill meant is not technical cleverness. It is the art of acting fully without being bound by the act: doing the work completely while leaving its credit and its blame alone. Work done this way tends also to be better work, because the attention is not divided by worry about oneself.