Bhagavad Gita 6.3
For the sage who seeks the heights of spiritual meditation, practice is the only method, and when they have attained it, they must maintain themselves there through continual self-control.
आरुरुक्षोर्मुनेर्योगं कर्म कारणमुच्यते।
योगारूढस्य तस्यैव शमः कारणमुच्यते॥ārurukṣormuneryogaṃ karma kāraṇamucyate|
yogārūḍhasya tasyaiva śamaḥ kāraṇamucyate||
English translation (above): Shri Purohit Swami (1935), public domain. Sanskrit text via github.com/gita/gita (Unlicense).