Bhagavad Gita 6.3 Chapter 6, Verse 3

आरुरुक्षोर्मुनेर्योगं कर्म कारणमुच्यते ।
योगारूढस्य तस्यैव शमः कारणमुच्यते ॥६.३॥

ārurukṣormuneryogaṃ karma kāraṇamucyate
yogārūḍhasya tasyaiva śamaḥ kāraṇamucyate

Meaning

For the sage wishing to climb to yoga, action is said to be the means; for the same sage who has attained yoga, calm is said to be the means.

Newly written by Bhajan Dhun — scholarly review in progress.

Reference: Bhagavad Gita 6.3 (Chapter 6, The Yoga of Meditation (Atma Samyama Yoga), Verse 3)