धृत्या यया धारयते मनःप्राणेन्द्रियक्रियाः।योगेनाव्यभिचारिण्या धृतिः सा पार्थ सात्त्विकी
dhṛityā yayā dhārayate manaḥ-prāṇendriya-kriyāḥ yogenāvyabhichāriṇyā dhṛitiḥ sā pārtha sāttvikī
The conviction and steady concentration with which the mind, the energy, and the senses are controlled—O Arjuna!—are the result of purity.
Translated by Shri Purohit Swami
The unwavering firmness, through which Yoga restrains the functions of the mind, life-force, and senses—that firmness, O Arjuna, is Sattvic (pure).
Translated by Swami Sivananda
Word meanings (from the gita/gita dataset)
dhṛityā—by determining; yayā—which; dhārayate—sustains; manaḥ—of the mind; prāṇa—life-airs; indriya—senses; kriyāḥ—activities; yogena—through Yog; avyabhichāriṇyā—with steadfastness; dhṛitiḥ—determination; sā—that; pārtha—Arjun, the son of Pritha; sāttvikī—in the mode of goodness