धृत्या यया धारयते मनःप्राणेन्द्रियक्रियाः।
योगेनाव्यभिचारिण्या धृतिः सा पार्थ सात्त्विकी।।18.33।।
18.33 O Partha, the firmness that is unfailing through concentration, with which one restrains the functions of the mind, vital forces and the organs, that firmness is born of sattva.
18.33 That Dhrti by which one through unswerving Yoga sustains the activities of the mind and the vital force and the sense-organs is said to be of the nature of Sattva. Yoga is worship of the Lord which forms the means for release. The meaning is that the Dhrti or fortitude by means of which one sustains the activities of the mind and other organs in the practice of Yoga (worship) until ones object is accomplished, is of the nature of Sattva.
Dhrityaa yayaa dhaarayate manah praanendriyakriyaah; Yogenaavyabhichaarinyaa dhritih saa paartha saattwikee.
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