Chapter 18 · Liberation through Renunciation · Krishna said
Bhagavad Gita 18.33 — Sattvic resolve
धृत्या यया धारयते मनःप्राणेन्द्रियक्रियाः। योगेनाव्यभिचारिण्या धृतिः सा पार्थ सात्त्विकी ॥
dhṛtyā yayā dhārayate manaḥprāṇendriyakriyāḥ | yogenāvyabhicāriṇyā dhṛtiḥ sā pārtha sāttvikī ||
Meaning
The unwavering resolve by which, through yoga, one holds steady the workings of the mind, breath and senses is sattvic.