Śrīmad-Bhāgavatam · Text 12.7.21
Who is speaking and story frame
विरमेत यदा चित्तं हित्वा वृत्तित्रयं स्वयम् ।
योगेन वा तदात्मानं वेदेहाया निवर्तते ॥ २१ ॥
virameta yadā cittaṁ
hitvā vṛtti-trayaṁ svayam
yogena vā tadātmānaṁ
vedehāyā nivartate
Either automatically or because of one’s regulated spiritual practice, one’s mind may stop functioning on the material platform of waking consciousness, sleep and deep sleep. Then one understands the Supreme Soul and withdraws from material endeavor.
Read the purport on Vedabase.ioFrom Canto 10, chapter 14 onward, the translation and purports were completed by Śrīla Prabhupāda's disciples after his departure, and published by the Bhaktivedanta Book Trust.