Chapter 6 · The Yoga of Meditation · Krishna said
Bhagavad Gita 6.3 — Climbing to yoga
आरुरुक्षोर्मुनेर्योगं कर्म कारणमुच्यते। योगारूढस्य तस्यैव शमः कारणमुच्यते ॥
ārurukṣormuneryogaṃ karma kāraṇamucyate | yogārūḍhasya tasyaiva śamaḥ kāraṇamucyate ||
Meaning
For the seeker who wishes to climb to yoga, action is said to be the means. For one who has reached yoga, calm stillness is the means.