धृत्या यया धारयते मनःप्राणेन्द्रियक्रियाः | योगेनाव्यभिचारिण्या धृतिः सा पार्थ सात्त्विकी
dhṛtyā yayā dhārayate manaḥprāṇendriyakriyāḥ . yogenāvyabhicāriṇyā dhṛtiḥ sā pārtha sāttvikī
喔，波陀之子，那藉由不動搖的瑜伽（Yoga）專注，能維持心意、生命氣息（Prana）和感官功能的堅毅，是屬於悅性（Sattva）的。
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.
當堅毅在心中覺醒時，心意、生命氣息和感官的活動便受到控制。感官被收攝入心意。普拉那（Prana）和阿帕那（Apana）進入中脈（Sushumna Nadi）。瑜伽（Yoga）即是三摩地（Samadhi）或心意的專注。你不能僅憑堅毅來約束心意、生命氣息和感官。你只能藉由始終伴隨著心意專注的堅毅來控制它們。當心意、生命氣息和感官被堅定不移的堅毅所遏制時，它們就無法奔向外在的感官對象，無法製造任何惡作劇，無法以違背經典的方式行動，它們將被吸收到各自的因中，其外向的傾向將被完全制止。這種堅毅不是壓抑或抑制，而是一種智能的昇華和內在的轉化。
When firmness is awakened in the mind? the activities of the mind? the lifeforce and the senses are brought under control. The senses are withdrawn into the mind. The Prana and the Apana pass into the Sushumna Nadi.Yoga Samadhi or concentration of the mind. You cannot restrain the mind? the lifeforce and the senses by mere firmness. You can control them only by firmness which is ever accompanied by concentration of the mind.When the mind? the lifeforce and the senses are curbed by unwarvering firmness? they cannot run towards external sensual objects? they cannot do any mischief? they cannot move in ways which are opposed to the scriptures? they will be absorbed into their respective causes and their outgoing tendencies will be totally checked.This firmness is not repression or suppression? but an intelligent sublimation and inner transformation.