Thereafter, the yogī should merge his mind, by his unalloyed intelligence, into the living entity, and then merge the living entity into the Superself. And by doing this, the fully satisfied living entity becomes situated in the supreme stage of satisfaction, so that he ceases from all other activities.
Srimad Bhagavata Purana
श्रीमद्भागवतमहापुराणम्
मूल श्लोकः
मनः स्वबुध्यामलया नियम्य क्षेत्रज्ञ एतां निनयेत्तमात्मनि । आत्मानमात्मन्यवरुध्य धीरो लब्धोपशान्तिर्विरमेत कृत्यात्
manaḥ svabudhyāmalayā niyamya kṣetrajña etāṃ ninayettamātmani | ātmānamātmanyavarudhya dhīro labdhopaśāntirvirameta kṛtyāt
SB 2.2.16