Bhagavad Gita 18.33 Chapter 18, Verse 33

धृत्या यया धारयते मनःप्राणेन्द्रियक्रियाः ।
योगेनाव्यभिचारिण्या धृतिः सा पार्थ सात्त्विकी ॥१८.३३॥

dhṛtyā yayā dhārayate manaḥprāṇendriyakriyāḥ
yogenāvyabhicāriṇyā dhṛtiḥ sā pārtha sāttvikī

Meaning

The unwavering resolve by which one controls the activities of mind, breath and senses through yoga — that resolve, O Partha, is sattvic.

Newly written by Bhajan Dhun — scholarly review in progress.

Reference: Bhagavad Gita 18.33 (Chapter 18, Liberation through Renunciation (Moksha Sannyasa Yoga), Verse 33)