Bhagavad Gita 2.48

योगस्थः कुरु कर्माणि सङ्गं त्यक्त्वा धनञ्जय।सिद्ध्यसिद्ध्योः समो भूत्वा समत्वं योग उच्यते॥

yogasthaḥ kuru karmāṇi saṅgaṃ tyaktvā dhanañjaya |siddhyasiddhyoḥ samo bhūtvā samatvaṃ yoga ucyate ||

Perform action, O Arjuna, being steadfast in Yoga, abandoning attachment and balanced in success and failure; evenness of mind is called Yoga.

Revised: Perform all your actions with your mind concentrated on the Divine, renouncing attachment and looking upon success and failure with an equal eye. Spirituality implies equanimity.

Our plain-language meaning of this verse is waiting for scholar review.