Chapter 6 · verse 3 · gita.yoga.org
Bhagavad Gita 6.3
आरुरुक्षोर्मुनेर्योगं कर्म कारणमुच्यते। योगारूढस्य तस्यैव शमः कारणमुच्यते
For a sage who wishes to attain to Yoga, action is said to be the means; for the same sage who has attained Yoga, inaction is said to be the means.