BG 2.50
बुद्धियुक्तो जहातीह उभे सुकृतदुष्कृते
तस्माद्योगाय युज्यस्व योगः कर्मसु कौशलम्
buddhiyukto jahātīha ubhe sukṛtaduṣkṛte
tasmādyogāya yujyasva yogaḥ karmasu kauśalam
TRANSLATION
A man with evenness of mind discards here and now good and evil. Therefore endeavour for Yoga. Yoga is skill in action.
PURPORT
He, who is established in evenness of mind in the performance of actions, relinquishes good and evil Karmas which have accumulated from time immemorial causing bondage endlessly. Therefore acquire this aforesaid evenness of mind (Buddhi Yoga). Yoga is skill in action. That is, this evenness of mind when one is engaged in action, is possible through great skill, i.e., ability.