Bhagavad Gita · 6.3

आरुरुक्षोर्मुनेर्योगं कर्म कारणमुच्यते।योगारूढस्य तस्यैव शमः कारणमुच्यते॥

ārurukṣhor muner yogaṁ karma kāraṇam uchyate yogārūḍhasya tasyaiva śhamaḥ kāraṇam uchyate

For a sage who wishes to ascend to yoga, selfless action is said to be the means. For one who has already attained yoga, tranquility is said to be the means.

— Bhagavad Gita 6.3

Source: Sacred-Texts.com (Sanskrit) + Bhagavad-Gita.io (translations)